You can enroll your students in more than one course on CodeHS by going to "Manage Course Enrollment" from your section page.
After you've selected "Manage Course Enrollment", scroll down to Course and Playlist Enrollment and click “Add More Courses from the Catalog” button. This will take you to the course catalog, where you can then enroll your section.
From there, you can simply click the Enroll My Sections button for whichever course you would like students to be enrolled in.
You can choose which section you would like to enroll in that course by switching the tab on your section to read “Yes”.
Now, your students will be able to see on their homepage that they are enrolled in multiple courses, and can now begin completing lessons in that additional course.
The Main Course should be the course that you want your class to be automatically taken to when they log into CodeHS. Make sure to press "Save" to save your changes.