You cannot add course links to discussion boards, folders, or learning modules. You also cannot add course links within Ultra documents or Announcements.
Instructions
To add a course link to your course content area:
Click the + icon and select Create from the menu.
In the Create Item panel, select Link
Switch to the Course Link tab.
Search for and select the item you want to link
Click the Save button.
The visibility of a course link is tied to the visibility of the linked content.