I have multiple bills that need to be applied to one purchase order in order to match. How can I keep the purchase order open until all of the bills are added?

The purchase order will stay open until it's fully allocated to the bills, Kimmy. I'll assist you in applying multiple bills to a single purchase order.

After creating the purchase order, you can edit the existing bill to add the purchase order details. Here’s how to do it:
 

1. Go to Expenses, select Vendors, and choose the vendor you want to manage.
2. In the Transaction List, click on the bill you want to edit.
3. Under Product/Service, delete the item you previously added to prevent it from duplicating in the purchase order you are about to add.
4. In the right corner of your screen, click the arrow to show the Add to Bill option.
5. Locate the purchase order you created and click Add.
6. Modify the QTY based on the QTY you used for the bill you created.
7. Once done, click Save and Close.

If finished, repeat the steps above to add the same purchase order for the remaining bills you created.

Once you've finished adding purchase orders to your bills and are ready to make payments, ensure proper recording of bills you paid to have accurate transaction tracking.

The Community is always here to support you, from managing multiple bills to tracking bill payments in QBO, Kimmy. Please feel free to ask for help; we're eager to assist and guide you throughout the process.