I created a fixed asset account for a truck paid in full. I also entered a bill for the vendor who sold it. the amount has been recorded twice. who can I fix this? help

Thank you for posting here, @newstartproduce.

Let me guide you fix the duplicated amount recorded in your QuickBooks Online (QBO).

You can follow these steps on how to delete the duplicated payment:

1. Select Banking at the left navigation pane.
2. Choose Make Deposits.
3. Click to select the line containing the duplicate payment you want to delete.
4. Select the Edit menu, then click Delete Line.
5. Hit Save. 

I'll be adding this article that will guide you on how to record your credit card payments in QuickBooks Online: Record credit card payments.

Please let me know if you have additional queries. I'd be glad to help. Thank you and Take care.