Is there a way to add an additional course to the one already assigned to the class?

I am using Code.org for the first time and need a little advice! I assigned the easiest course to my students but now see that they clearly are able to do more difficult or challenging work. How do I add or change the course that they are working on?

Go to the teacher dashboard and find the course that you want to assign to your students. Click on View Course. On the course page, there is an option to assign course. You can select which section you want to assign the course to.