Open the course for the term you wish to update.
Click on Import Existing Content in the right-hand menu:
Click on the Content Type Drop Down menu and select Copy a Canvas Course
Then in the Search for a Course Box enter the title of your Master Course or the course you want to insert into the current term. Select the course from the listing.
Select All Content and then Click on Import.
The status will show up under Current Jobs:
Refresh the course to see your newly imported content.