Purchase Order Question

We are well-versed in creating estimates but have never been able to fully get the purchase orders to work in a way that benefits us.

When we create an estimate, we use two general "items" -material or labor- then add the corresponding quantity. For the description we type out the specific product we will be purchasing (I.E. brand & product description), the MPN we put the manufacturer's specific part number for the item, and the cost we apply a markup, as normal.

From the estimate page, when we select create a purchase order the only categories that transfer over are the item, quantity, and final cost categories. This does not help us since the categories we truly need are quantity, description, MPN, and final cost (after markup). Is there a way to manipulate the purchase orders to provide the correct information that will make it useful to our purchasing department?

Thanks in advance!