diff --git a/InvenTree/InvenTree/api_version.py b/InvenTree/InvenTree/api_version.py
index 692ec09480..48dc8df775 100644
--- a/InvenTree/InvenTree/api_version.py
+++ b/InvenTree/InvenTree/api_version.py
@@ -1,11 +1,17 @@
 """InvenTree API version information."""
 
 # InvenTree API version
-INVENTREE_API_VERSION = 177
+INVENTREE_API_VERSION = 178
 """Increment this API version number whenever there is a significant change to the API that any clients need to know about."""
 
 INVENTREE_API_TEXT = """
 
+v178 - 2024-02-29 : https://github.com/inventree/InvenTree/pull/6604
+    - Adds "external_stock" field to the Part API endpoint
+    - Adds "external_stock" field to the BomItem API endpoint
+    - Adds "external_stock" field to the BuildLine API endpoint
+    - Stock quantites represented in the BuildLine API endpoint are now filtered by Build.source_location
+
 v177 - 2024-02-27 : https://github.com/inventree/InvenTree/pull/6581
     - Adds "subcategoies" count to PartCategoryTree serializer
     - Adds "sublocations" count to StockLocationTree serializer
diff --git a/InvenTree/build/api.py b/InvenTree/build/api.py
index 47fd8ae0cf..291e0694ae 100644
--- a/InvenTree/build/api.py
+++ b/InvenTree/build/api.py
@@ -314,11 +314,21 @@ class BuildLineEndpoint:
     queryset = BuildLine.objects.all()
     serializer_class = build.serializers.BuildLineSerializer
 
+    def get_source_build(self) -> Build:
+        """Return the source Build object for the BuildLine queryset.
+
+        This source build is used to filter the available stock for each BuildLine.
+
+        - If this is a "detail" view, use the build associated with the line
+        - If this is a "list" view, use the build associated with the request
+        """
+        raise NotImplementedError("get_source_build must be implemented in the child class")
+
     def get_queryset(self):
         """Override queryset to select-related and annotate"""
         queryset = super().get_queryset()
-
-        queryset = build.serializers.BuildLineSerializer.annotate_queryset(queryset)
+        source_build = self.get_source_build()
+        queryset = build.serializers.BuildLineSerializer.annotate_queryset(queryset, build=source_build)
 
         return queryset
 
@@ -353,10 +363,26 @@ class BuildLineList(BuildLineEndpoint, ListCreateAPI):
         'bom_item__reference',
     ]
 
+    def get_source_build(self) -> Build:
+        """Return the target build for the BuildLine queryset."""
+
+        try:
+            build_id = self.request.query_params.get('build', None)
+            if build_id:
+                build = Build.objects.get(pk=build_id)
+                return build
+        except (Build.DoesNotExist, AttributeError, ValueError):
+            pass
+
+        return None
 
 class BuildLineDetail(BuildLineEndpoint, RetrieveUpdateDestroyAPI):
     """API endpoint for detail view of a BuildLine object."""
-    pass
+
+    def get_source_build(self) -> Build:
+        """Return the target source location for the BuildLine queryset."""
+
+        return None
 
 
 class BuildOrderContextMixin:
diff --git a/InvenTree/build/serializers.py b/InvenTree/build/serializers.py
index 41299f04b1..0ae06ef18f 100644
--- a/InvenTree/build/serializers.py
+++ b/InvenTree/build/serializers.py
@@ -1083,6 +1083,7 @@ class BuildLineSerializer(InvenTreeModelSerializer):
             'available_substitute_stock',
             'available_variant_stock',
             'total_available_stock',
+            'external_stock',
         ]
 
         read_only_fields = [
@@ -1124,15 +1125,23 @@ class BuildLineSerializer(InvenTreeModelSerializer):
     available_substitute_stock = serializers.FloatField(read_only=True)
     available_variant_stock = serializers.FloatField(read_only=True)
     total_available_stock = serializers.FloatField(read_only=True)
+    external_stock = serializers.FloatField(read_only=True)
 
     @staticmethod
-    def annotate_queryset(queryset):
+    def annotate_queryset(queryset, build=None):
         """Add extra annotations to the queryset:
 
         - allocated: Total stock quantity allocated against this build line
         - available: Total stock available for allocation against this build line
         - on_order: Total stock on order for this build line
         - in_production: Total stock currently in production for this build line
+
+        Arguments:
+            queryset: The queryset to annotate
+            build: The build order to filter against (optional)
+
+        Note: If the 'build' is provided, we can use it to filter available stock, depending on the specified location for the build
+
         """
         queryset = queryset.select_related(
             'build', 'bom_item',
@@ -1169,6 +1178,18 @@ class BuildLineSerializer(InvenTreeModelSerializer):
 
         ref = 'bom_item__sub_part__'
 
+        stock_filter = None
+
+        if build is not None and build.take_from is not None:
+            location = build.take_from
+            # Filter by locations below the specified location
+            stock_filter = Q(
+                location__tree_id=location.tree_id,
+                location__lft__gte=location.lft,
+                location__rght__lte=location.rght,
+                location__level__gte=location.level,
+            )
+
         # Annotate the "in_production" quantity
         queryset = queryset.annotate(
             in_production=part.filters.annotate_in_production_quantity(reference=ref)
@@ -1181,10 +1202,8 @@ class BuildLineSerializer(InvenTreeModelSerializer):
         )
 
         # Annotate the "available" quantity
-        # TODO: In the future, this should be refactored.
-        # TODO: Note that part.serializers.BomItemSerializer also has a similar annotation
         queryset = queryset.alias(
-            total_stock=part.filters.annotate_total_stock(reference=ref),
+            total_stock=part.filters.annotate_total_stock(reference=ref, filter=stock_filter),
             allocated_to_sales_orders=part.filters.annotate_sales_order_allocations(reference=ref),
             allocated_to_build_orders=part.filters.annotate_build_order_allocations(reference=ref),
         )
@@ -1197,11 +1216,21 @@ class BuildLineSerializer(InvenTreeModelSerializer):
             )
         )
 
+        external_stock_filter = Q(location__external=True)
+
+        if stock_filter:
+            external_stock_filter &= stock_filter
+
+        # Add 'external stock' annotations
+        queryset = queryset.annotate(
+            external_stock=part.filters.annotate_total_stock(reference=ref, filter=external_stock_filter)
+        )
+
         ref = 'bom_item__substitutes__part__'
 
         # Extract similar information for any 'substitute' parts
         queryset = queryset.alias(
-            substitute_stock=part.filters.annotate_total_stock(reference=ref),
+            substitute_stock=part.filters.annotate_total_stock(reference=ref, filter=stock_filter),
             substitute_build_allocations=part.filters.annotate_build_order_allocations(reference=ref),
             substitute_sales_allocations=part.filters.annotate_sales_order_allocations(reference=ref)
         )
@@ -1215,7 +1244,7 @@ class BuildLineSerializer(InvenTreeModelSerializer):
         )
 
         # Annotate the queryset with 'available variant stock' information
-        variant_stock_query = part.filters.variant_stock_query(reference='bom_item__sub_part__')
+        variant_stock_query = part.filters.variant_stock_query(reference='bom_item__sub_part__', filter=stock_filter)
 
         queryset = queryset.alias(
             variant_stock_total=part.filters.annotate_variant_quantity(variant_stock_query, reference='quantity'),
diff --git a/InvenTree/build/templates/build/detail.html b/InvenTree/build/templates/build/detail.html
index 19438e70f5..3d2e5d4e96 100644
--- a/InvenTree/build/templates/build/detail.html
+++ b/InvenTree/build/templates/build/detail.html
@@ -200,6 +200,11 @@
         <div id='build-lines-toolbar'>
             {% include "filter_list.html" with id='buildlines' %}
         </div>
+        {% if build.take_from %}
+        <div class='alert alert-block alert-info'>
+            {% trans "Available stock has been filtered based on specified source location for this build order" %}
+        </div>
+        {% endif %}
         <table class='table table-striped table-condensed' id='build-lines-table' data-toolbar='#build-lines-toolbar'></table>
     </div>
 </div>
@@ -374,6 +379,9 @@ onPanelLoad('allocate', function() {
         "#build-lines-table",
         {{ build.pk }},
         {
+            {% if build.take_from %}
+            location: {{ build.take_from.pk }},
+            {% endif %}
             {% if build.project_code %}
             project_code: {{ build.project_code.pk }},
             {% endif %}
diff --git a/InvenTree/part/api.py b/InvenTree/part/api.py
index 68d606a551..7b7ec1c7e5 100644
--- a/InvenTree/part/api.py
+++ b/InvenTree/part/api.py
@@ -1767,6 +1767,7 @@ class BomFilter(rest_filters.FilterSet):
     part_active = rest_filters.BooleanFilter(
         label='Master part is active', field_name='part__active'
     )
+
     part_trackable = rest_filters.BooleanFilter(
         label='Master part is trackable', field_name='part__trackable'
     )
@@ -1775,6 +1776,7 @@ class BomFilter(rest_filters.FilterSet):
     sub_part_trackable = rest_filters.BooleanFilter(
         label='Sub part is trackable', field_name='sub_part__trackable'
     )
+
     sub_part_assembly = rest_filters.BooleanFilter(
         label='Sub part is an assembly', field_name='sub_part__assembly'
     )
@@ -1814,6 +1816,22 @@ class BomFilter(rest_filters.FilterSet):
 
         return queryset.filter(q_a | q_b).distinct()
 
+    part = rest_filters.ModelChoiceFilter(
+        queryset=Part.objects.all(), method='filter_part', label=_('Part')
+    )
+
+    def filter_part(self, queryset, name, part):
+        """Filter the queryset based on the specified part."""
+        return queryset.filter(part.get_bom_item_filter())
+
+    uses = rest_filters.ModelChoiceFilter(
+        queryset=Part.objects.all(), method='filter_uses', label=_('Uses')
+    )
+
+    def filter_uses(self, queryset, name, part):
+        """Filter the queryset based on the specified part."""
+        return queryset.filter(part.get_used_in_bom_item_filter())
+
 
 class BomMixin:
     """Mixin class for BomItem API endpoints."""
@@ -1889,62 +1907,6 @@ class BomList(BomMixin, ListCreateDestroyAPIView):
             return JsonResponse(data, safe=False)
         return Response(data)
 
-    def filter_queryset(self, queryset):
-        """Custom query filtering for the BomItem list API."""
-        queryset = super().filter_queryset(queryset)
-
-        params = self.request.query_params
-
-        # Filter by part?
-        part = params.get('part', None)
-
-        if part is not None:
-            """
-            If we are filtering by "part", there are two cases to consider:
-
-            a) Bom items which are defined for *this* part
-            b) Inherited parts which are defined for a *parent* part
-
-            So we need to construct two queries!
-            """
-
-            # First, check that the part is actually valid!
-            try:
-                part = Part.objects.get(pk=part)
-
-                queryset = queryset.filter(part.get_bom_item_filter())
-
-            except (ValueError, Part.DoesNotExist):
-                pass
-
-        """
-        Filter by 'uses'?
-
-        Here we pass a part ID and return BOM items for any assemblies which "use" (or "require") that part.
-
-        There are multiple ways that an assembly can "use" a sub-part:
-
-        A) Directly specifying the sub_part in a BomItem field
-        B) Specifying a "template" part with inherited=True
-        C) Allowing variant parts to be substituted
-        D) Allowing direct substitute parts to be specified
-
-        - BOM items which are "inherited" by parts which are variants of the master BomItem
-        """
-        uses = params.get('uses', None)
-
-        if uses is not None:
-            try:
-                # Extract the part we are interested in
-                uses_part = Part.objects.get(pk=uses)
-
-                queryset = queryset.filter(uses_part.get_used_in_bom_item_filter())
-
-            except (ValueError, Part.DoesNotExist):
-                pass
-
-        return queryset
-
     filter_backends = SEARCH_ORDER_FILTER_ALIAS
 
     search_fields = [
diff --git a/InvenTree/part/filters.py b/InvenTree/part/filters.py
index f7303cc190..42a41eb923 100644
--- a/InvenTree/part/filters.py
+++ b/InvenTree/part/filters.py
@@ -107,7 +107,7 @@ def annotate_on_order_quantity(reference: str = ''):
     )
 
 
-def annotate_total_stock(reference: str = ''):
+def annotate_total_stock(reference: str = '', filter: Q = None):
     """Annotate 'total stock' quantity against a queryset.
 
     - This function calculates the 'total stock' for a given part
@@ -121,6 +121,9 @@ def annotate_total_stock(reference: str = ''):
     # Stock filter only returns 'in stock' items
     stock_filter = stock.models.StockItem.IN_STOCK_FILTER
 
+    if filter is not None:
+        stock_filter &= filter
+
     return Coalesce(
         SubquerySum(f'{reference}stock_items__quantity', filter=stock_filter),
         Decimal(0),
@@ -216,9 +219,7 @@ def annotate_sales_order_allocations(reference: str = ''):
     )
 
 
-def variant_stock_query(
-    reference: str = '', filter: Q = stock.models.StockItem.IN_STOCK_FILTER
-):
+def variant_stock_query(reference: str = '', filter: Q = None):
     """Create a queryset to retrieve all stock items for variant parts under the specified part.
 
     - Useful for annotating a queryset with aggregated information about variant parts
@@ -227,11 +228,16 @@ def variant_stock_query(
         reference: The relationship reference of the part from the current model
         filter: Q object which defines how to filter the returned StockItem instances
     """
+    stock_filter = stock.models.StockItem.IN_STOCK_FILTER
+
+    if filter:
+        stock_filter &= filter
+
     return stock.models.StockItem.objects.filter(
         part__tree_id=OuterRef(f'{reference}tree_id'),
         part__lft__gt=OuterRef(f'{reference}lft'),
         part__rght__lt=OuterRef(f'{reference}rght'),
-    ).filter(filter)
+    ).filter(stock_filter)
 
 
 def annotate_variant_quantity(subquery: Q, reference: str = 'quantity'):
diff --git a/InvenTree/part/serializers.py b/InvenTree/part/serializers.py
index 175c1b5036..c09504853c 100644
--- a/InvenTree/part/serializers.py
+++ b/InvenTree/part/serializers.py
@@ -610,6 +610,7 @@ class PartSerializer(
             'stock_item_count',
             'suppliers',
             'total_in_stock',
+            'external_stock',
             'unallocated_stock',
             'variant_stock',
             # Fields only used for Part creation
@@ -734,6 +735,12 @@ class PartSerializer(
             )
         )
 
+        queryset = queryset.annotate(
+            external_stock=part.filters.annotate_total_stock(
+                filter=Q(location__external=True)
+            )
+        )
+
         # Annotate with the total 'available stock' quantity
         # This is the current stock, minus any allocations
         queryset = queryset.annotate(
@@ -780,14 +787,17 @@ class PartSerializer(
     allocated_to_sales_orders = serializers.FloatField(read_only=True)
     building = serializers.FloatField(read_only=True)
     in_stock = serializers.FloatField(read_only=True)
-    ordering = serializers.FloatField(read_only=True)
+    ordering = serializers.FloatField(read_only=True, label=_('On Order'))
     required_for_build_orders = serializers.IntegerField(read_only=True)
     required_for_sales_orders = serializers.IntegerField(read_only=True)
-    stock_item_count = serializers.IntegerField(read_only=True)
-    suppliers = serializers.IntegerField(read_only=True)
-    total_in_stock = serializers.FloatField(read_only=True)
-    unallocated_stock = serializers.FloatField(read_only=True)
-    variant_stock = serializers.FloatField(read_only=True)
+    stock_item_count = serializers.IntegerField(read_only=True, label=_('Stock Items'))
+    suppliers = serializers.IntegerField(read_only=True, label=_('Suppliers'))
+    total_in_stock = serializers.FloatField(read_only=True, label=_('Total Stock'))
+    external_stock = serializers.FloatField(read_only=True, label=_('External Stock'))
+    unallocated_stock = serializers.FloatField(
+        read_only=True, label=_('Unallocated Stock')
+    )
+    variant_stock = serializers.FloatField(read_only=True, label=_('Variant Stock'))
 
     minimum_stock = serializers.FloatField()
 
@@ -1387,6 +1397,7 @@ class BomItemSerializer(InvenTree.serializers.InvenTreeModelSerializer):
             'available_stock',
             'available_substitute_stock',
             'available_variant_stock',
+            'external_stock',
             # Annotated field describing quantity on order
             'on_order',
             # Annotated field describing quantity being built
@@ -1456,6 +1467,8 @@ class BomItemSerializer(InvenTree.serializers.InvenTreeModelSerializer):
     available_substitute_stock = serializers.FloatField(read_only=True)
     available_variant_stock = serializers.FloatField(read_only=True)
 
+    external_stock = serializers.FloatField(read_only=True)
+
     @staticmethod
     def setup_eager_loading(queryset):
         """Prefetch against the provided queryset to speed up database access."""
@@ -1534,6 +1547,13 @@ class BomItemSerializer(InvenTree.serializers.InvenTreeModelSerializer):
             )
         )
 
+        # Calculate 'external_stock'
+        queryset = queryset.annotate(
+            external_stock=part.filters.annotate_total_stock(
+                reference=ref, filter=Q(location__external=True)
+            )
+        )
+
         ref = 'substitutes__part__'
 
         # Extract similar information for any 'substitute' parts
diff --git a/InvenTree/templates/js/translated/bom.js b/InvenTree/templates/js/translated/bom.js
index ebf1caec67..11d03c095e 100644
--- a/InvenTree/templates/js/translated/bom.js
+++ b/InvenTree/templates/js/translated/bom.js
@@ -1172,12 +1172,18 @@ function loadBomTable(table, options={}) {
 
             var available_stock = availableQuantity(row);
 
+            var external_stock = row.external_stock ?? 0;
+
             var text = renderLink(`${available_stock}`, url);
 
             if (row.sub_part_detail && row.sub_part_detail.units) {
                 text += ` <small>${row.sub_part_detail.units}</small>`;
             }
 
+            if (external_stock > 0) {
+                text += makeIconBadge('fa-sitemap', `{% trans "External stock" %}: ${external_stock}`);
+            }
+
             if (available_stock <= 0) {
                 text += makeIconBadge('fa-times-circle icon-red', '{% trans "No Stock Available" %}');
             } else {
diff --git a/InvenTree/templates/js/translated/build.js b/InvenTree/templates/js/translated/build.js
index 97b9ba3095..a8026414b7 100644
--- a/InvenTree/templates/js/translated/build.js
+++ b/InvenTree/templates/js/translated/build.js
@@ -2618,6 +2618,10 @@ function loadBuildLineTable(table, build_id, options={}) {
                         icons += makeIconBadge('fa-tools icon-blue', `{% trans "In Production" %}: ${formatDecimal(row.in_production)}`);
                     }
 
+                    if (row.external_stock > 0) {
+                        icons += makeIconBadge('fa-sitemap', `{% trans "External stock" %}: ${row.external_stock}`);
+                    }
+
                     return renderLink(text, url) + icons;
                 }
             },
@@ -2730,6 +2734,7 @@ function loadBuildLineTable(table, build_id, options={}) {
 
         allocateStockToBuild(build_id, [row], {
             output: options.output,
+            source_location: options.location,
             success: function() {
                 $(table).bootstrapTable('refresh');
             }
diff --git a/InvenTree/templates/js/translated/part.js b/InvenTree/templates/js/translated/part.js
index 240734e958..ffcea223d3 100644
--- a/InvenTree/templates/js/translated/part.js
+++ b/InvenTree/templates/js/translated/part.js
@@ -2804,6 +2804,15 @@ function loadPartCategoryTable(table, options) {
                 title: '{% trans "Parts" %}',
                 switchable: true,
                 sortable: true,
+            },
+            {
+                field: 'structural',
+                title: '{% trans "Structural" %}',
+                switchable: true,
+                sortable: true,
+                formatter: function(value) {
+                    return yesNoLabel(value);
+                }
             }
         ]
     });
diff --git a/src/frontend/src/tables/bom/BomTable.tsx b/src/frontend/src/tables/bom/BomTable.tsx
index 3bbcb00744..8eacb88e78 100644
--- a/src/frontend/src/tables/bom/BomTable.tsx
+++ b/src/frontend/src/tables/bom/BomTable.tsx
@@ -142,7 +142,7 @@ export function BomTable({
       },
       {
         accessor: 'available_stock',
-
+        sortable: true,
         render: (record) => {
           let extra: ReactNode[] = [];
 
@@ -157,6 +157,14 @@ export function BomTable({
               available_stock
             );
 
+          if (record.external_stock > 0) {
+            extra.push(
+              <Text key="external">
+                {t`External stock`}: {record.external_stock}
+              </Text>
+            );
+          }
+
           if (record.available_substitute_stock > 0) {
             extra.push(
               <Text key="substitute">
diff --git a/src/frontend/src/tables/build/BuildLineTable.tsx b/src/frontend/src/tables/build/BuildLineTable.tsx
index 5bd53c8801..edd93949be 100644
--- a/src/frontend/src/tables/build/BuildLineTable.tsx
+++ b/src/frontend/src/tables/build/BuildLineTable.tsx
@@ -94,6 +94,15 @@ export default function BuildLineTable({ params = {} }: { params?: any }) {
       );
     }
 
+    // Account for "external" stock
+    if (record.external_stock > 0) {
+      extra.push(
+        <Text key="external" size="sm">
+          {t`External stock`}: {record.external_stock}
+        </Text>
+      );
+    }
+
     return (
       <TableHoverCard
         value={
diff --git a/src/frontend/src/tables/part/PartTable.tsx b/src/frontend/src/tables/part/PartTable.tsx
index 49dc743f66..0b2f281888 100644
--- a/src/frontend/src/tables/part/PartTable.tsx
+++ b/src/frontend/src/tables/part/PartTable.tsx
@@ -113,7 +113,17 @@ function partTableColumns(): TableColumn[] {
 
         if (available != stock) {
           extra.push(
-            <Text key="available">{t`Available` + `: ${available}`}</Text>
+            <Text key="available">
+              {t`Available`}: {available}
+            </Text>
+          );
+        }
+
+        if (record.external_stock > 0) {
+          extra.push(
+            <Text key="external">
+              {t`External stock`}: {record.external_stock}
+            </Text>
           );
         }