Modifying a timetable after producing

[aysam]

Hi to you all
Thanks in advance for helping as I'm a newie to FET
After producing the school timetable I was asked to modify two teachers' timetables
How can I do without changing the other teachers' timetables ?
Awaiting your reply.

[Volker Dirr]

generate the dataset.
then
fet -> data -> time constrains ->activities ->an activity has a preffred starting time
fet -> data -> room constrains ->activities ->an activity has a preffred room
modify it
then generate again

[aysam]

Thanks Volker for your help
I'd try and be back