Is there a constraint that solves the problem of only placing 2 out of n subject

[onlines92]

Hi!
I have a small question
Math, physics, chemistry ... is a logical and difficult subject for students, arranging a daily schedule with all 3 subjects will cause overload.
Is there a constraint that solves the problem of only placing 2 out of n subjects in a day?

[Liviu Lalescu]

Students activity tag max hours daily.

[onlines92]

I tried it today, it really helps, however
Adding activity cards every teaching hour is very time consuming, perhaps we need a tool that can add activity cards for an entire subject?
I use Google translate

[Liviu Lalescu]

Sorry, you need to use this constraint. It is not that difficult, just double-click each activity and add the tag to it.

[onlines92]

Thank you for your help