Server Configuration > User and Group Permissions > Deleting Dynamic Groups
  
Deleting Dynamic Groups
If there is a dynamic group that is no longer required, you can delete it. You can delete more than one dynamic group at a time.
To delete an existing dynamic group using the GUI
1. From the Dynamic Groups view, select Dynamic Group > Delete. The Confirm Dynamic Group Deletion confirmation box displays.
2. To delete the selected group, click Yes.