1. In the left-hand side menu, click "Institution" > "Manage Classes".
2. Choose a class from the list and click "Actions" > "Manage Timetables".
3. Next to the timetable name, click "Actions" > "Remove" > "Yes".
Note: If a timetable you're trying to remove has attendance data linked to it, then you'll need to additionally confirm the removal of a timetable which will result in irreversible removal of all attendance data of that class.
This is an additional step which warns the user that he/she is solely responsible for this action.