I have installed ULMO openedx using tutor. Now how can i make a group of subjects like sem1>sub1,sub2 sub3 so and so. Same way sem2>sub1, sub2,sub3 so and so

i have installed ULMO openedx using tutor. Now how can i make a group of subjects like sem1>sub1,sub2 sub3 so and so. Same way sem2>sub1, sub2,sub3 so and so