Express allows you to edit an existing Department's name to one you choose.
Edit Department
Select Departments from the Administration drop down menu. Depending on your Security Permissions you will see a list of all Departments or only your Department.
Select the Edit button under the Options column of the Department you wish to Edit.
Edit the Name, Default Callback Number, and/or Default Extension as needed.
Select the Save button. If data is valid then you will be taken to the Department list.
A Confirmation bar will appear at the top of the page.