Hi Gary,
You wouldn't need a profile for a dimmer packs.
Dimmer packs are generic and don't have any special values, say colors or gobos or prisms.
All you need to do is go to the generic page and use a par 56 or par 64.
So if you have a 4 ch dimmer as you do with the dp-dmx20l you will use a par 56 then say you have 4 units.
If you have a 12ch dimmer say like the Elation RMD-1210 you will use a par 56 and then put that you have 12 fixtures.