I can only go with experience, but I used a 40% pin code on 3 different ressies in a 10 day time span. We stayed at Pop our first nite, then rented points to stay at the BC. Then I used it for our room when we moved over to POR. My sons flew in on the last weekend, that we were there, and I was able to book them a room with our 40% off. We were going to leave the last 2 days to Miami, because we were going to the Nascar Race in Homestead. We decided to drive down and just come back, and we were able to extend our stay with both rooms with my pin code.
So that is my experience with a pin code. As long as the pin code was in my name, I could basically use the code how I wanted and I booked the rooms in my name, and told them, who was staying in each room.
(my dh almost killed me, for making 3 different resorts/split stays, he likes to stay put).