Master PO how to address with iDR

We have master PO that have a large spend added at beginning of year and then we purchase goods and add as that line. But invoice PDFs show each good itemized so its not matching perfectly to the 1 line of the mast PO on the invoice PDF. When we test this even though there is spend available the invoice is not matching as the description and quantity are not matching. Is there any way to get these master PO lines to match with our itemized invoices using IDR?