I had to decline 5 booking requests during those two weeks, because I have listed four bedrooms in my home, but Airbnb has advertised only one. So, I have people wanting to book the four rooms, but pay only for one of them, because Airbnb is automatically giving them a total price for one room, which is far too cheap.
You will need to create a listing for each unit you want to rent. If you want to be able to rent all 4 rooms as a unit, then you will need to create a listing for that as well. You'll want to spend some time in the Help area so you don't miss important information. This is explained here: https://www.airbnb.com/help/article/289/how-do-i-list-multiple-rooms