Thank you for your help however it does not work. 

The sales order has a field (custom field created) called Customer PO

This is the field need to have on the pick/pack express. 

I already did the edit under the template and it does not carry forward. 

I even renamed the pick/pack template and then when i tested it in the sales order fulfillment sheet, the form i renamed is different, which it explains why though i customized the form it does not pick up the data. 

The question i have is where is the Pick/Pack express form stored and how do i adjust it. Thank you