It applied it all as credit as we were rebooking - so the amount due was $0 each time. There isn't anywhere (we could find) that showed how much credit is currently available after the cancelations/rebooks, hopefully once their system processes it all it will show up somewhere. Someone above mentioned they will refund the difference to our credit card after a few days, I'll try to remember to update to confirm.
We did have some problems with their site erroring out (also previously mentioned). We had one 'normal' page open to do the cancelations and then an incognito window open to rebook after we canceled each one. No problems getting it to work in the incognito window.