We just returned from WDW with a group of 12. My family had 2 rooms with a total of 2A and 4C and my friend also had 2 rooms with 2A and 4C. We booked our trip with the same CM and checked in with the same CM at POP. Here is the weird thing. Her room keys had 2AC 4C on them and would open both doors and one card had all her credits. Mine were 1A 2C each and we had to use two cards every time we paid since the credits were split. The CM checking it us in says it was just the way it was put in the system and she couldn't change it. I also had only one ressie number and guaranteed connecting rooms, so go figure. Some TS waiters insisted we use both cards while others really pushed us to use up one card and then use up the other. I made sure they used both cards as to not mess everything up for our 2 credit dinner in the castle on the last night. It was a few more numbers to keep track of but not too bad. So, I guess you'll find out at check-in how it is set up (my CRO CM assured all the dining credits would be together on 1 card not 2, but be prepared just in case).