Scott, if you want to import everything (the whole list of resources and activities) from a course to others, you could try to use the course as a course template, as suggested by Mary Cooch in this very useful post.
We created about 100 new courses using a course template to replicate in each new course the basical activities and resources. Please have a look to the documentation about Course templates and about Upload courses.
Thanks for the reply.
I guess I should have explained that I am trying to create one course, but with several classes (groups? cohorts? sections? not sure of the terminology) taught by different teachers. To create the initial master course, I used a course template and then made classes for each of the teachers. However, as the courses progress, I would like to add more activities/resources to all the classes. The way things are now, I am having to import individually into each of the classes. I just wondered IF there were a way or another plugin/filter that would allow me to pick an activity or resource and then copy that into several classes at once.
Any help to do this would be greatly appreciated.