Level Taxonomy helps in creating levels and sub levels in courses.
1.Enable levels
Go to Vibe option panel->course manager->Enable levels.
2.Go to Lms->Levels->Add new levels
3.Select parent for creating sub level.
4. Go to the course and select level for the course.
5.Go To Appearance->widgets->Buddypress and add buddypress course filter widget and checked the checkbox of show level filter and save.
6.Filter courses based on levels in course directory.
7.See the level in course detail area.
8.Resave your permalinks .