"make indipendent" a component from a giving point in time

Hi all, i have this question: I know I can make a compinent copy indipendent, and modify it without affecting the other copies.

But let's say I want to do this: have a component that inherits the changes made to the origilan one for the part it was derived from, but that can accept new features.

Basic example: i want to do a connector between A and B.

Then i need a connector between A and C.

I want to have two components where B and C are changed individually, but modifying part A affect both.

Hope I was clear, and hope it is possible.

Thanks!

SolidworksParts And Features