1. Click the ellipsis to the right of the Course Content header and select "Copy Items":
2. Click the name of the course you would like to duplicate items from:
3. Select the items you would like to duplicate. Clicking the checkbox will select all content within an item:
4. When you have completed your selections, click “Start Copy”:
Copies of duplicated items will now appear in the Course Content stream. By default, they are hidden until you make them visible to students.