Hi Justine!
It's so nice to hear from you again!
It's definitely possible to make a
Fantasmic! Meal Experience package reservation and to use your Disney Dining Plan to pay for it with.
You won't be able to change your existing Hollywood & Vine reservation
into a package. You'll need to search for availability for the package reservation which you can do here
online if you choose.
Reserving the package really is worth it as it saves you time later in the evening since you won't need to arrive quite as early to secure seating. Keep in mind that the package is also available at Mama Melrose's Ristorante Italiano (my personal favourite) also for a single, Table Service Credit under the Disney Dining Plan. In addition, you may also wish to search for a lunch reservation package since dinners often book out in advance. Even at lunch, you'll still receive a voucher for seating at an evening showing of Fantasmic! Your server will advise you of the show time and present your voucher at the end of your meal.
If you prefer, call in to Disney Dining at (407) WDW-DINE and request that a Cast Member search for a Fantasmic! Meal Experience package for you. They can advise you of availability for both lunch and dinner and even cancel your other reservation for you.
Please write me back any time you wish if I may assist you further Justine!
I'd love to hear from you again!
Wishing you a Magical time at Walt Disney World!
Kirsten