'''Note:''' If you add bookings manually, place single room bookings into the Single or Double room as appropriate, no the virtual room.
'''Example 3:''' A B&B has only five Twin rooms which can be sold as twin rooms, as singles or as double rooms.
9) For the Twin set "Include Bookings from" = Single and Double
'''Note:''' If you are using the channel manager and a channel allows multiple room bookings you are opening more rooms than you physically have. This causes a risk of overbookings.