Options for Changing a Multiple BOM 
There are two ways of changing a multiple BOM.
- If you want to change an item that is used in one alternative of a multiple BOM (variant part), choose Material BOM
®
Change.
See
Changing one Alternative in a Multiple BOM.
- If you want to change an item that is used in all alternatives of a BOM group (non-variable part), choose BOM group
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Change.
See
Hints on Changing a BOM Group.