Class time off
By clicking on Time off... you can specify when a particular class can or cannot have the lessons. For example, if class 8.A attends a holy mass every Wednesday's morning, or children have to stand every Friday afternoon on honor guard at the monument of your famous national poet, you can disable these such possitions in the timetable.
You can specify the suitability by clicking on the cells or row/column headers.
See also:
Time-off