WARNING! If you create content in one section before cross-listing, it is critical to use the section with content as the “parent section” into which you cross-list the other (presumably content-free) sections. Only the content of the parent section survives the cross-listing process. 

How to weave two or more sections of a course (such as Math 590) into one Canvas course that can be administered as a single course with options to differentiate sections - for example, by creating one assignment that has different due dates for different sections.