Hi there, @riveracepeda ...
The easiest way to copy content from one course to another is to use the Course Import Tool in Canvas. As you are following the directions in the link that I'll give you, you'll want to be sure that you are in one of your empty course shells (sections)...as you will be selecting the course that has the content from that empty course shell. You'll repeat the same procedure for your other courses. Here is the Guide to follow: How do I copy content from another Canvas course using the Course Import tool?.
I hope this Guide will be of help to you, Manuel. Please let Community members know if you have any other questions about this. Good luck! Stay safe...be well!
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