Hi NS86,
The only way to move transactions from one customer account to another customer account is using memos, unless the invoice is paid, in which case you would create a new invoice and payment on the new customer's account, then correct the General Ledger with a journal entry, like a debit to sales and credit to cash, which results in a zero affect to the GL since the invoice debits AR account and credits sales and the payment debits cash and credits AR.
Thanks,
Janice

The invoices had been paid so I did as you advised and that worked great other than now if I go into sales by customer the total is incorrect. The "one time customer account" is still off. This may not be a big deal but is there a way to make it correct?

If you want to reverse the transactions for the one time customer account, then void the payment, and enter credit memo to close the invoice. Don't do the journal entry for the new customer's account because you will want to keep the debit to cash and credit to sales. This may seem a bit confusing so you might want to call Customer Support to speak with an analyst - 800-447-5700, option 3.

I did as you suggested here and now my bank rec is off. The calculated statement balance is now higher than my statement ending balance.

What I did was reverse the journal entry that corrected the general ledger and then went to bank transactions and entered a withdraw applied to the sales account. The customer accounts are still off but that should be ok.