All the pay codes display order can be located on the Pay Code Management screen.  To access the screen, hover on the PEP icon, the System Config link and then click on the Pay Codes navigation link.  The first pick list to the right of the pay code’s name is the Display Order. 

The display order pick list sets the order in which pay codes will be displayed in the pick list. For example, if you wanted the Regular pay code to be at the top of the list since it is used the most; you would assign it a display order of 1.   Multiple pay codes may have the same display order, in which case these codes will be displayed alphabetically within their group.  If no display order is set, then the pay codes will be listed alphabetically after the pay codes with a display order.