Group Administrator

The only way I can think of is to create a new group for each category. Otherwise, the images are grouped as they are entered and accepted. There's also a group for group admins, too --

http://fineartamerica.com/groups/group-and-contest-administrators.html?tab=overview

Thank you Joseph :)

It is so helpful for me ,altough I was in the wrong discussion place, thanks for your answer Joseph...