[ADD] manufacturing: Setting up a BoM for a Product With Sub-Assemblies

manufacturing/overview/bill_of_materials.rst

@@ -7,4 +7,5 @@ Bill of Materials
 
    getting_started/bill_configuration
    bill_of_materials/kit_shipping
-   bill_of_materials/product_variants
+   bill_of_materials/product_variants
+   bill_of_materials/sub_assemblies

manufacturing/overview/bill_of_materials/sub_assemblies.rst

@@ -0,0 +1,42 @@
+==================================================
+Setting up a BoM for a Product With Sub-Assemblies
+==================================================
+
+A subassembly is a manufactured product which is intended to be used as
+a component of another manufactured product. You may wish to employ
+sub-assemblies to simplify a complex BoM, to more accurately represent
+your manufacturing flow, or to use the same subassembly in multiple
+BoMs. A BoM that employs subassemblies is often referred to as a
+multi-level BoM.
+
+Multi-level bills of materials in Odoo are accomplished by creating a
+top-level BoM and subassembly BoMs. Next, the procurement route of the
+subassembly product is defined. This ensures that every time a
+manufacturing order for the top-level product is created, a
+manufacturing order for each subassembly is created as well.
+
+Configure the Top -Level Product BoM
+------------------------------------
+
+To configure a multi-level BoM, create the top-level product and its
+BoM. Include any subassemblies in the list of components. Create a BoM
+for each subassembly as you would for any product.
+
+.. image:: media/sub_assemblies01.png
+    :align: center
+
+Configure the Subassembly Product Data
+--------------------------------------
+
+On the product form of the subassembly, you must select the routes
+**Manufacture** and **Make To Order**. The **Manufacture**
+route takes precedence over the **Buy** route, so selecting the
+latter will have no effect.
+
+.. image:: media/sub_assemblies02.png
+    :align: center
+
+If you would like to be able to purchase the subassembly in addition to
+manufacturing it, select **Can be Purchased**. All other fields on
+the subassembly product form may be configured according to your
+preference.