"Submit As" which I think should be a clone, does nto seem to be working for me.
Through CLI however the clone options still works flawless (ie. ap-group <new-group> clone <old-group>) so that is what I've been using.
Renaming pretty much anything is not possible with Aruba controllers. AP-group cannot be renamed.
Remember that if you're using cloning to try and rename an ap-group, this will not change for your AP's so you will have to move them into the new group which requires the AP to reboot.