Dear Community... Help I would be very apreative of some assistance with how to clean up PO orders that have not been matched to Categorized expense in banking.

You can use the exporter tool to export PO with the open status.

Change the status to close and modify other fields if required. Then use the importer tool to replace the PO.

https://get.transactionpro.com/qbo

Use the backup restore app before importing data to lower any risks.

https://partnerwithus.rewind.com/quickbooks

Thank you for posting in the Community, Frank.

I'll share information on how you can close purchase orders from your system.

Please know that purchase orders are non-posting transactions. That said, it can't affect your account when matching it to categorize expenses. 

In your case, you can manually close each purchase order to clean it up. Let me guide you on how.

1. On the left navigation panel, select Expenses.
2. Go to the vendor to pull up your purchase order.
3. Choose the transaction, then click to open it.
4. Select the Open drop-down button under the Vendor name.
5. Click the Purchase Order status drop-down arrow, then pick Closed.
6. Hit Save and close.

Moreover, once you've received the product from your vendor, you can add purchase orders to expenses, bills, or checks to close the transaction. 

In the future, if you wish to organize your transactions, you can check on this article as your guide:  Categorize online bank transactions in QuickBooks Online. 

Inform me immediately if you have further queries regarding your purchase order in QuickBooks Online. I'm always here to lend a hand.