Yes, you can transfer your existing reservation to
Dreams Unlimited by following the instructions in
This Link. In the Special Requests box, just put "DU Agent-Rhonda" so it will come to me.
Then, after the transfer is through, I'll start watching for discounts to be released that I can apply to the reservation (including AAA)!
One note: Disney will only transfer reservations that have not yet been paid in full. If you are paid in full, you'll have to call and have the AAA discount applied yourself.