How to calculate procurement price in The purchase orders

How to calculate procurement price in The purchase orders

I have some product. This product has 2 prices: Procurement and Unit price. In price offer for buyers everything is ok, but when I need to send Purchase Order to Supplier he also see in grand total Unit prices, but I need show him only procurement price grand total.

If smb knows how to do it (which tags should I use), reply me, please

Kind Regards
Timur

marketing@meteoinstruments.com