I'm working on a motion study and try to figure out how to add an assembly mate to the motion study. When creating a new motion study it includes all assembly mates. When creating a new assembly mate it is added to the motion study. The assembly mates can then be deleted from the motion study (see screenshot below), but I can't figure how to add an assembly mate to to motion study. Almost seems the only way would be to delete all assembly mates and recreate them or create a new motion study and start from scratch. That can't be true though, can it?
Delete assembly mate from motion study:
Ooops! Nope, I want them back... but how???