Navigate to Admin > Manage Courses, Curriculum Tags tab for the appropriate course.
Use the Curriculum Period selector to go to the curriculum period to which you want to copy assigned tags.
On the Associated Curriculum Tags list click on the copy icon on the left below any existing tags.
In the Copy From selector, pick the curriculum period you want to copy curriculum tags from.
Once a curriculum period is selected, the relevant curriculum tags will display.
Click the green Confirm button.
Note that any contextually-linked tags will also be copied.
Note that if a curriculum period already has curriculum tags assigned and then you also copy tags from another curriculum period, any new tags will be added to the list, and any contextual linkages will overwrite the existing tag mappings.