You would use the Master Timetable to create your initial timetable. If your educators had a staff meeting on Friday afternoons while the learners left early, you could modify the Educator Master and the Class Master accordingly before copying these to their respective destinations. You also have the ability to modify the lowest level of the timetables based on their requirements. i.e. the headmaster's timetable could be either blocked or a miscellaneous period assigned to the periods that he or she would not be available.