Hi Tim,

To add content to existing courses, you can pull content using the "import" process. Details here;
https://community.canvaslms.com/t5/Instructor-Guide/How-do-I-copy-content-from-another-Canvas-course...

If you want to select specific content, click the Select specific content radio button [2].

If you chose to select specific content in your course, the current job will show as Waiting for selection [2], which means you must select the content you want to import.

-Ann