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Glad you came her in the Community for support, cindyb4307.
I want to make sure your concern about correcting transactions that were mistakenly recorded in the wrong account gets sorted out.
There isn't a way we can move those payments but to delete the vendor payments and recreate them to the correct QuickBooks Online (QBO) account.
Let me show you how to locate and delete a vendor payment in QBO:
Here's an article that you can refer to when deleting vendor payments: How to delete a bill.
Once done, you can start recreating the vendor payments in QBO.
Let me know if you have other concerns or questions about vendor payments. I'd be glad to help you some more.