Hello again, @eric51. Thanks for adding a screenshot and detailed information.
What you're doing is right. You can create a Bill in your QuickBooks Online (QBO) account and make a payment via Bill.com. As the bill you created from QBO will sync to Bill.com. The same goes for the payment.
To avoid duplicates, I recommend following the suggestion provided by my colleagues above.
Also, I suggest making sure you have set your sync preferences correctly. To check, you may consider contacting Bill.com support. This way, they'll be able to verify your settings.
To learn more about how online bill pay works in QBO, see the below articles:
Don't hesitate to post here again if you have further questions about this. I'm always around to help you have a good one.
