Yes, you can add a complete recurring series of classes to your course. But you cannot add a single class of the recurring series to your course. This feature is not available currently.
There are two ways to add a recurring series to your course:
1. Add recurring series to your course while scheduling
While you are scheduling your recurring series from “Schedule a Class “ page, click on “Add more information about yourself and your class” link. A list of all your courses will be displayed next to the section named “Add this class to course:”. Select the courses in which you want to add the recurring series to. You can choose multiple courses. Once you have completed filling all the information on this page, click on the “Schedule and Continue” button. Your recurring series will be added to the courses selected.
2. Add recurring series to your course from the class listing
You can add recurring series to your course anytime by simply going to class list from from “My Classes and Recordings” link. Here you will see the list of all your classes. From here, go to the recurring series you want to add to the course, and click on “Add to course”. Select the courses to which you want to add your recurring series (you can choose multiple courses) and click on the “Add Class” button. Your recurring series will be added to the courses selected.