Hi Danielle,
Welcome back to the Disney Parks Moms Panel. It sounds like you are engaged in some excellent planning! I am assuming that you have a resort reservation and dining plan. If you are using a
Dining Plan and referring to the meal credits that come with the dining plan, you can certainly immediately make another dining reservation after you cancel your reservation at Cinderella's Royal Table if there is availability.
However, as I am sure you know, reservations at
Cinderella's Royal Table are difficult to get, so if you cancel a reservation, you may not be able to make another reservation after the fact. My advice would be to make the additional reservation, then cancel the first reservation. As long as the reservations are on different days, you should be able to make the change in that way.
As always, you may call a Cast Member in dining if you need assistance. Their number is 407-939-1937.
Also, if you are traveling with little ones, have you considered a visit to Bibbidi Bobbidi Boutique? The
Bibbidi Bobbidi Boutique - Magic Kingdom and the
Bibbidi Bobbidi Boutique - Disney Springs have very special princess and knight packages.
I am sending extra pixie dust your way hoping that your changes are easy to make!
-Donyell