If you are using BedBooking as the Channel Manager for your property on Booking.com, availability is managed exclusively by BedBooking.
Do not make changes directly on the Booking.com extranet.
In order to prevent your guests, from making a reservation on the desired date, you can use two solutions:
Solution 1:
1. In the calendar, add a reservation with a status of Unavailable.
2. If you plan to block availability in more rooms, copy this reservation to other rooms.
Solution 2:
1. Remove prices for the selected date in the BedBooking Price list.
2. No prices for a specific date, automatically blocks guests from booking.