In a course with no forum, no news forum no assignments: change the content of a course by deleting old files and adding new ones.
In course areas with assignments, discussions any other tool that has student data in it (choice, feedback, quiz etc) you will need to think about resetting the course to remove old data. The easiest way to do this is to remove the students and their data. Before you do this you MUST BE VERY SURE that you have saved all of the data that you might need later. if you are not sure that you need to do this, contact TaLIC (firstname.lastname@example.org).