@Susanna333 No one from Airbnb customer service will help you with that, and in fact, may give you misleading, even more confusing, and erroneous information. They are all outsourced workers who know next to nothing about Airbnb processes and policies. Occasionally you can luck out and get someone knowledgeable, but there's little guarantee of that.
It isn't that complicated- pretend you only have one room to rent, with communal shared areas and create a listing for that. Then do the same with the other rooms.
I don't know how to link calendars, as I only have one listing, but there are instructions for that in the Help section of the main Airbnb site, and if you find it confusing, I'm sure other hosts here who have linked calendars can assist.