You may have a large list of attributes and you want the pull down lists on various screens to show the more common attributes at the top and less common attributes at the bottom. All codes within Gestalt have a Display priority field which allow you to influence the display order. The lower the Display priority the higher in the list the value will appear.
By default, all attributes and code values are given a value of 50. Your Gestalt Administrator can change this value in the Setup menu.