Want to change Incident-Add'l Field format

Want to change Incident-Add'l Field format

We would like to change an existing required field on Incident Templates from Multi-Line Free Text Format to Multi-Line Pick List.   Is this possible without creating a new field and editing all the templates?

Example.   Currently "Department" is a Required Field for a "User Security, Menu, Directory Change" Request.  The field is Multi-Line Free Form Text.
We would like to make this field a Multi-Line Pick List.  Thereby bringing consistency in input by users.  Option to select 1 of 14 designated departments.
This eliminates misspelling, abbreviations, inconsistencies in classifications.

I was able to successfully change the Service Request Additional Field for Department but cannot change for Incident Additional Fields.

Is there a way to change the Incident Additional Field as needed?

Thank you,
Cheryl
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