brotherton-erpnext/erpnext/docs/user/manual/en/manufacturing/articles/nested-bom-structure.md

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Nested BOM Structure

Question: Our manufacturing process involves producing sub-assembly items before final product. How should we manage BOM master in this scenario?

Answer: You should create BOM for item in the order of their production. Let's consider an example to understand this better.

If Computer manufacturer assembles Hard Disk and DVD Drive (sub-assemblies) themselves, they should first create BOM for Hard Disk and DVD Drive. After that BOM for Computer will be created, which is finished and saleable item. BOM of computer will have  Hard Disk and DVD Drive (sub-assemblies) will be selected as raw-material items in it. BOM ID will be fetched for the respective sub-assembly item.


Following is how the structure of nested BOM will look:

Computer (FG Item)
--- Mother Board
--- SMTP
--- Accessories and wires
--- Hard Disk (sub-assembly)
      ------ Item A
      ------ Item B
      ------ Item C
--- DVD Drive (sub-assembly)
      ------ Item X
      ------ Item Y
      ------ Item Z