The
DVC member night at Splitsville is not associated with the dining plan. The Splitsville member night must be booked and paid for for at time of reservation, and comes with a meal/drink for each person and some apps to share depending on party size. Not sure if you are asking if you can lower the price by using dining credits, but you cannot.
It was a fun time for our family and organized very well but way too much food was left when we were done lol.