We have the same scenario this trip, but I listed all guests on the reservation since we don’t exceed occupancy. I suspect you’d have to have separate reservations if total number of guests exceeds occupancy.
I’m wondering if it will be a problem requesting extra linens mid-stay. We’ve asked for extra towels many times, but never sheets.
We were just there a few weeks ago staying on our points. I called housekeeping one morning and requested new sheets for one of the beds. Housekeeping was at the door not 10 minutes later handing over the sheets. No questions asked - well except which size bed we needed them for.
It's Disney. They have so many kids there I don't think they would blink an eye at a request for new sheets if you just need them for one or two beds. I just did a swap at the door. I didn't ask housekeeping to actually put them on for me.