John,
In CE52E, go to the "group" tab in the menu bar, top of the screen. Click it, open "channel allocations/group alpha tag."
Next, find "GRP.2" on the allocation window and enter the number of channels you're going to put in the group.
Finally, under "GRP.2" change disable to enable. close out the allocation window and go back to the main page. Use F2 to change groups. It should now let you edit group 2.
Hope this helps. Good little radios. I've had several.