I don't spend any time in Jira, but I'm working on a project that involves sending emails to Jira to create new issues. The client would like the form to show new options in the dropdowns for fields like Department, but the field options in Jira have not yet been updated. She's concerned about reporting on historical data.
For example, if a unit was previously called "ABC" but is now "CBA", would it be better for reporting purposes to add the option "CBA" to the custom field, or to rename "ABC" to "CBA"? What impact would changing the option have on their reporting of current and historical data?