First - Chat Tag release has nothing to do with group control; you're asking in the wrong area.
If you have further questions regarding groups, find the proper section.
Second, In Gmod, superadmin is the highest group Gmod is written to see.
Gmod has only a "IsSuperadmin" code function - no "IsOwner".
If you have any mod or gamemode that uses owner. you need to go ask in the site/forum supporting THAT gamemode.
http://forums.ulyssesmod.net/index.php/topic,6291.0.htmlI now return you to your normally scheduled discussion of PLAYER CHAT TAGS; not HOW DO I DO GROUPS?