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Thanks again Liviu for your screenshots. They make it clear to me

Thanks Liviu  for your reply.
I want to make it clear. When a student is enrolled in a course, he has to take both the theoretical  and practical parts. And as I said before, theoretical classes are bigger than practical ones. So, for theoretical classes students are divided into two groups, and for practical into 4 groups.
I gave a look to the attached file. You did not use "Divide year by selecting categories ", right? 
So simply, I need to use year, groups and subgroups only as in your file.

Second question:
I want to make sure, when I work on the activities. I assign the teachers to the groups not to the subgroups, right?

Hello there,
Our program consists of 8 levels. For each level, students are divided in groups. Some courses have theoretical and practical classes. For theoretical classes in general students are divided into two groups. And for the practical classes students are divided into 4 groups due to the limited capacity of the labs. For example:
Sam teaches Computer Networks (THEORETICAL) for level 4 (Group A + Group B) [students are divided int 2 groups]
Sara teach Computer Networks (LAB) for level 4 (Group C + Group D + Group E + Group F) [same students are divided into 4 groups]

How can I assign activities in this case?

Thanks,