I duplicated a course by mistake. Can I delete it while keeping its belonging contents like cards?

You can't delete a course without deleting its contents.

You can delete bulk cards in a section.

1. Go to "card list" page from "Course Management" on the left column.

2. Push "Select All", or check the boxes of the cards that you want to delete.

3. When a box is checked, you can select "Delete all selected card".

4. Make sure if there's any problem on "Card Bulk Delete" page, then push "Delete" button.