@Richard2329 You can't list 2 rooms you want to rent separately on one listing. You need to create a separate listing for each room, show only that room and common spaces in the photo gallery, max number of guests and beds for that room only.
Then you can create a third listing which combines both rooms.
And as William said, you have to then link the calendars so you can't get double booked. If someone wants the 2 bedroom option, the 2 separate bedrooms would get blocked to bookings. Or if one or both rooms got rented separately, the 2 bedroom option would get blocked.