Hi Nicole,
Regardless of how many rooms there are on your Resort confirmation number, you are able to make advance dining reservations (ADRs) for the whole of your travel party.
It is possible to make ADRs
online via the Walt Disney World website at 6.00am EST 180-days prior to your visit and if you wish to make your ADRs by telephone, lines open at 7.00am EST 180-days prior to your visit.
Be sure to log in to the Walt Disney World website before 6.00am EST to "Retrieve Your Reservation" by clicking on the My Disney Vacation tab (You will find this at the top of the home page, next to a yellow suitcase) before trying to make any ADRs. Once you have done this, you will be able to make ADRs for the first 10-days of your trip rather than having to do it one day at a time.
I would recommend that you firstly attempt to make your ADRs online as this will give you an hours head start on those Guests who will be ringing up to make theirs. If for some reason you are experiencing difficulties, you can then call (407) 939-3463 at 7.00am EST.
Ask for the most popular restaurants and any Character meals first as these tend to book up the quickest.
Wishing you a magical trip filled with memories which will last a lifetime!