How do I add a bill from a supplier to existing issued purchase order?

Great to see you here, @sarah-ddmechanic.

Let me help you add a bill to an existing purchase order in QuickBooks Online (QBO).

Here's how:
 

1. Hit + New.
2. Select Expense, Check, or Bill. 
3. From the Payee ▼ dropdown, select the vendor. This opens a window with their open purchase orders.
4. Select Add for the correct purchase order. This adds the items from the purchase order. They appear in the Item details section.
5. If you plan to bill a customer for a specific item, select the Billable checkbox. Then add the customer you plan to bill in the Customer column.
6. Tap Save and close.

You can check this article for details: Add purchase orders to expenses, bills, or checks in QuickBooks Online.

Also, feel free to visit the following articles for more tips while handling POs: Enter expenses, pay bills, write checks, and manage suppliers

Please don't hesitate to reply if you need further assistance with purchase orders. We're always here to help you.

What if I've issued a PO for lets say $8000 to a supplier, but they bills that they send to me will be a series of smaller bills at different times totalling to $8000. 

how do I put the $400 bill received towards the $8000 purchase order?

Thank you 

Hi there, sarah.  I know ho much you wanted to pay a bill to a purchase order (PO) in QuickBooks Online (QBO). 

When recording a partial payment, you just need to manually edit the amount once the PO is added to the bill.  

Here's how:

1. Go to + New.
2. Click  Bill under Vendors.
3. From the Payee ▼ dropdown, select the vendor. This opens a window with their open purchase orders.
4. When the Purchase Orders section appears on the right-hand side of the screen, click Add on that Purchase Order (PO).
5. Adjust the amount to $400.
6. Select Save and Close.

Once the amounts on the PO are accounted for across all of its linked transactions, it'll be automatically closed.

I've added this article for additional information, as well as the steps for adding a part of a PO to a transaction as well as updating its status: Create and send purchase orders in QuickBooks Online.

If you have any other questions or concerns about making partial payments for PO, you can always get back to us for assistance. We’ll be here to help. Keep safe!