@Mark3978 You can create 3 listings. 1 - the upstairs. 2 - the in-law unit. 3 - the upstairs and the in-law unit combined. Then you link the 3 Airbnb calendars so that if, for instance, the in-law unit is booked, that will be blocked and the upstairs unit will be available. If someone rents both together, the other two individual listings will be blocked. And so on.