Hi @Marcia777
Are you going to ever offer the entire home in addition to the rooms separately? If so, you would need a "parent" listing for the entire home and 3 "child" listings for each bedroom you are offering. You would have to link the calendars to prevent double bookings if this is the case. You can use the duplicate listing feature, but will still have to go in finish each listing. Host that do this find it helpful to keep sections of the listing in Word as a backup and just copy and paste.
If you are creating separate rooms, suggest you name them differently so guests can easily distinguish them.