Modifications of copied part of an sketch, changes original…

Hi all!
Here is my problem:
I’ve copied part of a sketch and moved it up away from original. The moment I wanted to rotate it, my original piece rotated too, messing up my entire sketch. Seems like copied element and its original change at this simultaneously. How can I fix this? Most of reasons I copy something, is to make changes ONLY in copied piece, not original….
Ant thoughts?