Add an opening balance after a transaction has been entered into sales?

Hello evers_carla, 

Thanks for contacting us here. QuickBooks Online is a hassle-free program that simplifies the way you manage your accounting. I'll be glad to point you in the right direction so you can achieve your QuickBooks goals. Recording your transactions the right way is a good exercise for keeping your books accurate.

To ensure accuracy in your books, I recommend contacting an accounting professional to get expert advice. Doing this will help prevent any future discrepancies in your books. You can also reach out to accounting professionals on our site using this link here. Feel free to check out this helpful article that shows you how to: Enter an opening balance for an account in QuickBooks Online.

I'll also leave this question here so other accounting professional members can chime in and share their expert advice. Let me know if you have other questions, I'm here to assist.