How to change header names

1. Go to Admin > Site Settings > Printing Settings and click on Order/Invoice under Print Layouts For SmartPrintPro
   
2.  On the Customer Order Layout Configurator, the user can rename Price & Orig. Price to different names. 
   
3.  In the example below,  Price was renamed to Net Price, Orig. Price was renamed to MSRP, after editing this form click on Save
   
4.  These changes can be seen on SmartPrintPro
   Customer Purchase Order
   Invoice