Start Group Manager from the Solstice Launcher and select the name service, if not done already.
See "How to Start Group Manager" for more information.
Select the group entry you want to delete from the Group Manager main window.
Choose Delete from the Edit menu.
A window is displayed asking you to confirm the deletion.
Click on OK.
The group entry is deleted from the Group Manager main window.
You can also use the admgroupdel command to delete a group.