Device Manager : Working with device groups : Deleting a device group
 
Deleting a device group
You can delete groups from the FortiManager system.
To delete a group:
1. Right-click the tree-menu against the group, select Device Group > Delete.
2. You will receive a pop-up confirmation dialog box.
3. Select OK.
 
You must delete all devices from the group before you can delete the group. You must delete all device groups from the ADOM before you can delete an ADOM.