You cannot delete a resource that is referenced in an access control rule, resource group, or WorkPlace shortcut. Before deleting a resource, you must first remove it from any rules in which it is referenced. See Deleting Referenced Objects for more details.
To delete a resource
In the AMC, navigate to Security Administration > Resources.
On the Resources page, select the check box to the left of any resources that you want to delete.
Click the Delete button.