There is a place to do so but can't remember where off the top of my head. I've tried using a the one I got from my TA and had no luck. I call Disney and they say that you can't do this using the TA-sourced number even though it is a DL number. Makes no sense.
I think you can.... I used My Disney Experience to keep track of all of our dinner and lunch reservations while at WDW. (Very handy by the way). When I booked my dinner reservations for our DL trip, they somehow automatically appeared in the MDE app. Don't know how that happened, but it was cool that it did.
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