The BOM usage allows you to maintain BOMs (for example, for material LAMP) for specific sections of your company. You can maintain a separate BOM for each section in your company (for example, production), so that each section only processes the items relevant to that section.
In customizing functions, you can define which item statuses can be used in which BOM usage. For example, all items in BOMs with a certain usage are relevant to production.
The usage is an important selection criterion in the BOM application, which controls automatic explosion of BOMs.