PLEASE HELP ABOUT TIME

[TAHIR]

I have 6 sets of  students , for example B1, B2 ,B3 , G1 , G2 , G3 and 6 hours (periods). I want to call set of students G1,G2,G3,B1  from period 1 to period 5  and  set of students B2,B3  from period 3 to period 6.
Is it possible ? if yes then how?
please help me.

[Volker Dirr]

please use studens set not available. please read the manual first. please don't double post in a forum.
i will check your file as soon as you done the 2 hints above. please ask ONE more time if you still have trouble after reading the manual.