Hi there, davidmatyas.
Thank you for visiting again the QuickBooks Community. I'll be sharing details to ensure you can record the partial PO that you've accepted.
QuickBooks Desktop doesn't have the option to directly record the received partial PO that you enter. The system will only allow you to manually edit the quantity or amount of those items that you didn't receive once the PO has been added to the bill. This way, you can pay the invoice or the items shipped from your vendor by recording it using the "Pay bills" feature.
Here's how:
- Click the Vendors menu at the top.
- Choose Enter Bills.
- Select the appropriate vendor.
- You'll be prompted with Open purchase orders exist for this vendor. Choose Yes.
- Checkmark the specific PO. Then, click OK.
- Put a zero for the items that you didn't receive in the quantity or amount field.
- Click Save and close.



Once done, you can now pay your bills with the exact amount. To see the steps on how to perform the process, you can click this article: Pay bills in QuickBooks Desktop.

Please refer to this article to view details on how you can quickly pay your vendor bills and records your payment automatically in QuickBooks so your records are accurate: Use Online Bill Pay in QuickBooks Desktop.
Drop me a comment below if you have any other questions about recording a partial PO. I'll be happy to help you out.