Hello,

We would like to take the invoice form and modify it but not replace the current form. When a customer comes they need a confirmation, and it ends up looking very similar to the invoice form. Therefore, I figured adding a few fields and replacing some on the form would be easier than creating a whole new module. 

I understand how to inherit and add the fields I want to the sale.order model, however, the view (xml) is causing me issues. The general structure of copying without overriding the original is what I need. Could someone help me, at least with a little guidance?

Thanks!