Definition of Multi-Level Bill of Materials (BOM)

A Multi-Level Bill of Materials (BOM) is a bill of materials (BOM) that lists the components, assemblies, and materials required to make a part. It provides a display of all components that are directly or indirectly used in a parent item. When an item is a subcomponent, blend, intermediate, etc., all of its components, including purchased parts and raw materials, are also exhibited. A multilevel structure can be illustrated by a tree with several levels.