Canvas, Adding sections to a course
This page has a link to Canvas documentation
The following contains information on how an instructor can add manually created sections to a course in Canvas: How do I add a section to a course as an instructor?
Please note: If you're trying to add a registrar-affiliated section/roster to your course site, this needs to be completed in the Space Request Application (go.illinois.edu/sra). For more information about adding or editing registrar-affiliated sections in your course site, see Canvas, Instructors, Adding and deleting rosters from a requested space