Navigate to your NEW empty course for the current semester.
Click on Import that you will find under the Gear icon on the top right side of the course.
There you will see a selection of your previous semester courses. Select the correct course you want to import by click the circle next to the course. Then click Continue.
In the next screen leave the selected Settings and click Jump to final step.
This might take a few minutes. Please do not refresh the page or click anything else.
Please note you might get an Error page when the import it's done. Please close the tab/window and open your course again to double check that the import is done before attempting again.