I agree with the other member. I think what we are both asking is how to reconcile invoices applied to open PO's by line items in that PO. 

As an example:

A PO is created for $100,000. It has three line items:

Item 1: $25,000

Item 2: $50,000

Item 3: $25,000

Invoice 1 arrives as follows:

Item 1: $20,000

Item 2: $50,000

Item 3: $0

Therefore, we have $20k of $25k applied to Item 1, $50k of $50k to Item 2, and $0 of $25k to Item 3. 

What we are asking is how to open the PO, where it shows the PO values above, and the Received column next to it, and click the "received" amount for it to show what invoices apply to that received amount. There is no link to do so. Opening every invoice and seeing how it links is very time-consuming. I've also run into a snag whereby QB says $X value is received, yet when I look at all the transactions I can't find how they add up to that amount. Especially as you add multiple POs by that same vendor. Even worse for me, one PO line item says "Closed", but I can't reconcile that and when I unlink an old invoice it doesn't unlink that closed PO, making reconciliation even harder. 

QB can't be this bad at PO management? It's really not that hard. I just need a way to click that "received" amount in the PO by PO line item to drill down into how QB derived that value.