If you want to change an element, select the respective period in the class or teacher timetable and open the context menu by a right-click of your mouse. Choose "Special duty / Change period". The dialogue window holds all information of the period you have selected. You now can change any master data element of this period.
Depending on which element you change, different consequences are triggered.
You can change the class in this dialogue window by choosing another class in the "Class" selection field and confirm with <OK>. Due to this change, the lesson is cancelled for the class which was shown in this field before. If1> a clash is produced for the selected class, the original lesson for this class is also cancelled. Additionally, a "Lesson changed" is generated. This line contains information on which elements have been changed.
If you want to select another teacher for a lesson, open the "Teacher" selection field. Via the "Only show available teachers" option, you can control whether you want to see all teachers or only those who do not teach at this point of time. Select the teacher you want for this lesson. If this teacher does not teach, a special duty is generated. If the teacher already teaches at this time, you are prompted with what you want to do next.
Choose one of the options and confirm with <OK>.
If you change the subject of the lesson, this will be shown as "Lesson changed" in the substitution list.
If you change the room of the lesson this way, a room substitution is generated.