At the heart of the Manufacturing system is the Bill of Materials (BOM). The BOM is a list of all materials (either bought or made) and operations that go into a finished product or sub-Item. In ERPNext, the component could have its own BOM hence forming a tree of Items with multiple levels.
To make accurate Purchase Requests, you must always maintain correct BOMs. To make a new BOM:
Manufacturing > Bill of Materials > New BOM
###Costing of a BOM
The Costing section in BOM gives an approximate cost of producing the Item.
Add the list of Items you require for each operation, with its quantity. This Item could be a purchased Item or a sub-assembly with its own BOM. If the row Item is a manufactured Item and has multiple BOMs, select the appropriate BOM. You can also define if a part of the Item goes into scrap.
This table lists down all the Material required for the Item to be Manufactured. It also fetches sub-assemblies along with the quantity.
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