Yes. If you have a Demo Course, we encourage you to use it to build a future course for which you don’t yet have a course shell. After you’ve built the course in your Demo Course, you will be able to easily copy from there to your future course shell(s). If you make a mistake and need to start over, you can “reset” a course to wipe out all data and return the course shell to its starting condition. For future reference, here’s the page on how to copy a course within Canvas.