This also interests me. We will be a "grand gathering" in August and I know that my son and family are going to want to go their way a couple times. We will be together each day for a meal but otherwise
When we were there as a grand gathering last September each group paid for their meals. We were actually there during free dining. There were three groups. When our server came we just let them know we needed three different tabs and who was on which bill and we never had a problem. So I would think you will be able to have the tabs broken out.