Copied courses are added to the same subaccount as the course that is copied.
Courses should be copied when you want to use or repurpose previously created content including course settings, syllabus, assignments, modules, files, pages, discussions, quizzes, and question banks. You can also copy or adjust events and due dates. Not all content can be copied as part of a course.
When you copy a Canvas course using the Copy this Course button, you will be added to the course as an instructor automatically.