I just want to change a few periods but keep the entire scheduled timetable, what should I do?
You can use the _data_and_timetable.fet from the results, or lock the current timetable; then modify the locking constraints.
Can you be more specific?
After you generate a timetable, you get in fet-results a file "file_data_and_timetable.fet", it has locked all the activities in time (activity preferred starting time) and in space (activity preferred room). You can use this file. Or after you generate you can go to Lock menu and lock the activities.
Then you can unlock some activities and generate again.
Ok. Thanks you
You're welcome! If there is any problem, write some more.