you can use the CSV to do this...best way if you have multiple users in multiple courses...you can find it on the Course Management page under the Enrol icon

posted a reply but it’s not appearing…

have a look at this post

I recommend first running a report that includes the username, course code, and the enrollment status. Then you can filter out the completed enrollments and your upload file will be ready to go! Follow the instructions @lrnlab has referred you to in his post. 

The other caveat is that if the courses are part of a learning plan, you have to unenroll the users from the learning plan before you can unenroll them from the courses.