Thanks for following up with the Community, malky.
 

In order to create multiple bills with purchase orders, you'll need to make a separate PO for each bill. You can use the steps provided by my colleague, MariaSoledadG, to produce each record.
 

Additionally, an order can be created, then bills can be applied to it as partial payments until it's paid in full.

Here's how:
1. If you haven't entered your order, do it now.
2. In the top menu bar, go to Vendors, then Enter Bills.
3. Choose a vendor.
4. Click Yes on your Open POs Exist window.
5. Pick a record and hit OK.
6. Enter the appropriate information in your available fields.
7. Press Save & Close.
 

Repeat this process until you've made your four bills, then go to Vendors and select Pay Bills when you're ready to pay them.
 

You'll be able to find many helpful resources about using QuickBooks in our help article archives.
 

Please feel welcome in sending a reply if there's any other questions. Have a wonderful day!