Additionally, you can add and remove licenses via a google sheet. Go to your users in the Admin Console and download all users with all 41 columns to a google sheet. Open the sheet and create a filter or sort by multiple criteria, but you are looking for the data in column AK. 1010310008 is a student license, 101310009 is a staff license.
Add or remove the licenses you want, save as CSV, then use the bulk update and viola!