Hierarchical Calendars
Open Plan supports hierarchical calendars. This means that calendars can have both a parent and any number of children.
Child calendars inherit from their parents. This means that if a given date is defined as a non-working day or a holiday in a parent calendar, it will have the same status in all its child calendars unless overridden in the child calendar.
While you can change the status of any day on a calendar, be aware that if you change the status of a day on a parent calendar, the status of that day is also changed on all of its child calendars.