Sales Order Template issues

Sales Order Template issues

How can I add another column in the product cost module on the Sales Order template? (I have "Quantity" and "Cost" but need a 3rd column for vendor cost (not to calculate in the "total price" field) 
Also, when I added extra stationary fields above the subtotal area, they are not calculating (ie: I need to add postage and service charges) The figures are mapping over fine, just not calculating in the subtotal and Grand Total.