We spoke with Centershift and were told that there is no way to make changes to lots of units at once. They said that you can contact your Centershift account manager and have them make these changes for you.
Changing the drop-down options
If you'd like to add a custom value to the drop-down menus (like we did in the screenshot above to add "Floor 2, Alarm"), it's easy!
Just head to Admin Custom Lookups: