Hello Mandy! Welcome to the Disney Parks Mom´s Panel.
To get a VIP spot at Fantasmic!, guests must book the
Fantasmic! Dinner Package.
Since you already have a regular Advance Dining Reservation at Hollywood & Vine, you may consider calling (407) 939-3463 and try to change the existing reservation to a dinner package.
If not, make the package reservation before canceling the existing reservation.
Fantasmic! is my favorite Walt Disney World nighttime show and usually all shows are packed.
Remember that the VIP voucher is on a first come, first serve basis, so arrive at least 30 minutes prior to show time.
Glad to help you plan a magical Disney vacation.
Hope to hear more from you.
Miguel