Changing Variant Bills of Material 
Use
Proceed in the following manner if you want to make changes in a task operation which applies to all variants in a BOM group.
If you want to change an individual BOM variant, proceed as for
Changing Bills of Material.Procedure
You are now on the initial screen for making changes to a BOM group.
You are now on the Summarized BOM screen, in which all items used in the BOM group are listed. To the right of the individual items you can see the variant in which the item occurs.