Hi Lynda, It sounds like you have an enchanting day in mind for your little princesses!
I've actually done the very same thing several times:
Bibbidi Bobbidi Boutique followed by
Cinderella's Royal Table. Since dining inside Cinderella Castle is a dream-come-true for many little girls, reservations are hard to secure. Don't worry though, with some advanced planning, you'll be in for a real treat.
Exactly 180 days in advance of your arrival date (which is
very soon), be online
HERE at 6:00am EST to book a reservation. You are able to make Advanced Dining Reservations for your entire stay at that time (have your Resort confirmation number handy). Be ready to book it quickly, as many Guests will be hoping to secure a sought after spot at the same time. I recommend lunch around noon, and then book Bibbidi Bobbidi Boutique around 10am. Be sure the first thing you reserve is lunch and that you do it right at 6:00am. If for some reason you would prefer to make your dining reservations over the phone, then you can call 407-WDW-DINE beginning at 7:00am EST that same day.
Your little girls are going to absolutely love Bibbidi Bobbidi Boutique as well as dining inside Cinderella Castle, and you'll cherish the memories forever too!
Wishing you lots of pixie-dust as you make your reservations,
Kaylene