I made a whole lot of mates in an assembly, about 30 of them, when I noticed I did one with the wrong part. So I went toi the tree and deleted the 3 wrong ones. The part wouldn't move out of the way. So I tried Edit / undo, expecting one mate to be removed.
But what happened was I got to watch EVERY one of them get undone, like a movie. Nothing would stop it. And Re-do is greyed out!!!!
Is there any way to get them back? Other than starting over?