Thanks for coming back and adding a clarification, @jim52.

The option to auto-fill for vendor payment terms is unavailable in QuickBooks Online (QBO). Once the auto-fill feature is turned on, this will automatically fill the other fields based on your last transaction. 

This is the reason why the last item you ordered is automatically filled on new purchase orders.

I can see how this option would be helpful for you and your business. Therefore, let me take note of this as a suggestion to improve your QuickBooks experience.

Additionally, you can personally send your own feedback to our product developers. This way, they can review your request and most likely include it in our future updates.

Here's how:
 

1. Select the Gear icon at the top, then click Feedback.
2. Enter your comments or product suggestions and select Next to submit.

In the meantime, I'd recommend manually selecting the payment terms when creating the transactions. This way, you set the terms as to when the invoice should be paid.

You can also visit our Firm of the Future site. This is where we share recent happenings and future developments, such as updates to newly added features.

If you have any other concerns, feedback, or questions, don't hesitate and come back to the Community. I'm always here to help you. Have a great day.