I did this this morning. They only asked for the original confirmation number. After they put it through their system the gave me the new total. ADR are not affected and they did not need my CC# again either.
I believe that this will depend on whether you already have a room only or a package reservation. If you have a package reservation, the change will be simple. But if you have a room only reservation and want to make the change, then you will need to make a new reservation which will require a new deposit. They will then cancel the room only reservation and refund any money that you have paid for this reservation. Room only reservations can not simply be changed to a package.
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