We had a bunch of users imported without a department. 
We created 800+ tickets that were categorized as "department= Not Assigned
We would like to change these tickets to have a proper department.
Is there a script that allows for us to do this even if it is 1 ticket at a time?
This old article seems to elude to this script:
How to change a department assigned to a ticket? (manageengine.com)