Add Child Calendar Dialog Box
The Add Child Calendar dialog box allows you to add a new calendar as a child of the calendar you selected in the Calendars dialog box.
The Calendar text box displays the selected calendar followed by a period. To create the child calendar, add the local part of the name after the period.
The calendar you create with this dialog box inherits the work days and holidays from its parent. This means that if a given date is defined as a non-working day in its parent calendar, this date will also be a non-working day on the new calendar you create unless overridden in the child calendar.