Is this Possible?

My Wife and I both have My Vegas accounts and we each have enough points for 2 nights of "free rooms". Could I make a 7 night reservation at New York, New York using the discount codes on the LVA (thank you Anthony!) and then redeem rewards and have 4 nights credited from this reservation?

No, you must reserve the room through MyVegas.

You could book 3 nights using the discount codes with NYNY, and then book the 4 nights with MyVegas. They will make you "check out" and then check back in, but that is pretty painless (10 minutes) and you don't have to change rooms.

Thank you for the quick response!

just a quick key change and you will be set.....they will tell you that you wont have too but it almost always works out so you just have to pop down to the front desk and make this switch.....Easy Squeezy.