I don't think they will let you book 180+10 without your resort reservation number. It would let me in January.
One tip... For me, I could not get an open reservation for Le Cellier online for dinner. I suspect they are blocking the ability to do so. Assuming that's the case, I really wish they would tell you to call in for reservations, rather than return a message that there is nothing available.
Anyway, I made all of the rest of my reservations online, then waited until phone reservations opened and was able to book dinner at Le Cellier without issues on the phone.