The HR Request Additional Information Field Set contains fields displayed at the bottom of the Details section of the WX New Employment Details Change page for legacy HR Requests.
By default, Lookup fields included in the Additional Information Field Set display as picklists. You can convert these fields to use combo box functionality by adding them to the HR Request Combo Box Field Set.
You can also display text fields included in the Additional Information Field Set as picklists - add the text field to the HR Request Pick Lists Field Set.