This may work, but since you can only transfer to people at the same physical address, this is a very limited answer.

OP, of you are actually trying to book the room for the other member, do it over the phone. Tell them who you are booking for and they should be able to set it up correctly under the other person's name and membership number. And in the event that the credit posts to your account by mistake, you should be able to call and fix it, since the program's rules state that the person whose name is on the reservation and who pays should get the credit.