I would like to modify one of the User details fields.

In user setup, there is a field called user_department.  I would like to create a drop down list to populate this field.  However, I don't see how to do that in the CRM interface.

If you go to the field list, it is not a field that appears on the field screen. 

Typically I would use the "Team" field to represent a department.  However, this system was not setup that way and currently the "Team" field represents a "City".

It is my assumption that this field is not displayed on the field list because it is a field that is used with one of the integrated systems.  In regards to the system I am working with, it is not integrated with one of the Sage CRM integrated systems available.

Since this is not an integrated system, would I run into any issues if I modify this field to accomodate a drop down list? (I understand that I would need to make the field visable and change the field type.)  

My other option would be to create a new field.  However, I think it is confusing to then have two department fields on the user setup screen....therefore, I would be looking to hide the current one.

I appreciate any assistance provided.  Thank you!