Switching Inside 30 Day Window

[DisneyFam2326]

We booked a last minute trip in a one bedroom. We are inside the 30 day window. I'd like to hunt for a 2 bedroom for the same dates so additional family can join us (flexible on the resort). If I submit a waitlist request for the exact same dates at the resort we are staying at and set it to replace our reservation will our points go into holding or will they just be used towards the two bedroom (plus any additional points we need). Thank you!