Define a double room available for one person
When registering my propertie on Booking.com, on rooms' type it was possible to define a double room available for one person (as single room) for reservation.
E.g. I have 10 double rooms and 5 single rooms. I'd like to make available 15 single roons, as I can accommodate one person in my double room.
I couldn't find this option anymore when editing my rooms. May you help me?