I have unused 2 day tickets on a MB. I want to add a NE 6 day with 2 admissions left on it. Can I do this? I want to use the NE for a 1 day visit. Also, I want to make FP+ reservations. If I can't add the NE, can I make FP+ with the unused 2 day MB and then use the NE as admission on that day? I am only going 1 day and do not want to mess up the unused 2 day.