A subject has a set of preferred rooms

[Cyrus Ireri]

Is it possible to ensure when i select that a subject has a set of preferred rooms, the two rooms selected will appear on the selected rooms and hence ensure no other subject can be slotted in those rooms?I have tried severally to apply the constraint but i end up having only one room appearing and also rooms selected having other subjects there hence collissions.This is majorly while dealing with science double sessions like biology & physic s double where more than one lab is needed at the same time.

[Cyrus Ireri]

My scenario as per now.I want BIO/PHY D to be taught at the same time at Upper and lower labs

[Cyrus Ireri]

Constraint already there

[Liviu Lalescu]

I don't understand too much, but if you want an activity to occupy two rooms, you can use virtual rooms. Please read the help about virtual rooms in the rooms dialogs.