It would be great if we could create a new group with the same membership of an existing one.

Case scenario:
Let's say I've got a group called "GroupA" with 100 members. Then I want to create another group that contains 80% of the users from GroupA. Instead of creating a new group from scratch and add each user, I'd create the new group based on and existing one and remove those users I don't want on the new group.

Workaround:
Described on this KB: https://confluence.atlassian.com/display/CROWDKB/How+To+Create+a+Copy+of+a+Group+Membership+to+a+New+Group+in+Crowd