You can delete notification groups when they are no longer in use or required.
In the Notification Groups view, click the Delete button for the notification group you would like to delete. You will be prompted to confirm that you want to delete the group.
Click Delete to confirm. The delete option permanently removes the notification group, and removes all set notifications to the group from all streams.
If everything went well, you will return to the Notification groups view and see a message saying that the group was successfully deleted.