Yes you can. I booked 2 insted of the 3 that I need. But what I am not sure of is I don't think you will get the disscount on a person that is not booked when you are on the ship. That is what I understood. If I am wrong I am sure some one will correct me. I booked because i wanted the 10% and 200 room credit. My cruise is not till August 0f 2006. So I have a lot of time to save.