Click on the help icon, type in "How do I list multiple rooms?" [or copy from here and paste in the search blank]
ABnB: If you want to list multiple rooms in your house, you can create a separate listing for each space you have available. Each room will have it’s own calendar and listing page that should accurately reflect the number of beds and amenities, as well as what space will be shared with others.
ABnB: You can also create a listing for your whole house and separate listings for individual rooms in the house, but be sure to sync your calendars. If you rent your entire house, block those dates on all the individual rooms so you won't double-book.
ME: I would give each room a unique name...i.e.: like the "Blue Room", "The Palms", or "Gold Suite", etc. that matches it in some way that you could easily keep them seperated.