In the side menu, hover over Classes & Lessons and click Lessons Admin.
At the top tab menu, click Classes.
Check the box(es) by the class(es) to edit or clone.
Select the desired option:
To edit, click Multi-Edit Basic Info. Update the fields that need to be changed and leave the fields that do not need updates blank.
To clone, click Multi-Clone. Update the fields that are different from the original class and leave the fields that stay same to blank.
When finished, click Save.