In a nutshell, you book your stay in segments but it stays under one reservation number.
You can then add any one of the dining plans--quick service, regular or deluxe--to any one of the segments.
I am leaving next week for a 5 night trip. I am staying two nights at BWV and had it booked as 2 segments so I could do the QSDP for night one and nothing for night two.
We then move to BLT for three nights. I booked that as 2 segments as well. I added the DxDDP for night one and nothing for nights two and three.
You do have to check out/in and there have been issues with it so we will see how it goes. We may not do it again, but are taking family this time and it made sense for the places we are eating.