There are two ways to cancel selected nights of a reservation in FrontDesk Master.
Bed View
Select nights you want to cancel by clicking them on Bed View (selected nights will be highlighted in red). Then, right-click on the reservation and choose the option Cancel selected nights:
Reservation Form
Open the Reservation Form and change the dates of the reservation for each guest separately or for the whole booking. For example, to cancel the last night of the reservation, change the check-out date to one day earlier.
You can see all cancelled nights in the Reservation Form. Click on the Eye icon and choose Show All. You can restore cancelled nights by clicking on the Restore icon:
See also: