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You can change hierarchical BC Sets as follows:
Prerequisites
You have already called the BC Set in change mode.

If you call a BC Set which is also used in other BC Sets, in change mode, you are warned that the other BC Sets will also be changed.
Procedure
Add lower-level BC Sets
You can only add BC Sets at the lowest level.
The specified BC Set is linked to the end of the BC Set structure.
Remove lower-level BC Sets from the hierarchy structure
BC Sets are linked to the hierarchy structure. You can delete these links in change mode. This only applies to BC Sets which are directly below the BC Set to be changed in the hierarchy.
Example: Remove lower-level BC Sets from the structure
You have opened BC Set A on level 1 in change mode. You can remove both BC Sets at level 2 from the structure. You delete the link between two BC Sets, not the BC Set itself. If you remove BC Set C from the structure, the links to the lower-level BC Sets D and E are also deleted. To remove BC Set F on level 4 from the structure, you must edit BC Set E on level 3 in change mode.
The lower-level BC Set is removed from the structure.

In contrast to the Delete function, only the links in the structure are deleted, not the BC Set itself.
Change BC Set short text, software component and validity range

You can choose a software component from the F4 help.
