Deleting/Restoring a Group or Class
When you delete a group or class that has been used in a prior event, it goes to a table at the he bottom of the group/class list and has a link to restore that group/class if needed.
When a group/class has been deleted, you will still be able to see that group/class listed in entries if you look at old events, but you will not be able to select those groups/classes in segments. You also likely could not filter the attendee or entry screen by those deleted classes/groups.