weights in FET

[Liviu Lalescu]

for a given ativity or subject or teacher, Can I set two rooms:   R1 with 100% and R2 with 80%, so R1 gets priority over R2 ?

I think you need this: a constraint preferred rooms, R1 and R2, 90% (or 100%) and preferred room R1, 90%-95%. Or other weights. But if you add room R1 100%, then the timetable will need this activity to be all the time in R1 -> probably impossible.