Hello, lotsofquestions.
Thanks for turning to the Community for support. I'd be happy to help.
QuickBooks Online provides the option to enter and manage opening balances. This guide will provided information as well as steps by step instructions on how to proceed. However, to ensure accuracy in your books, I recommend reaching out to an accounting professional for expert advice. They'll be able to guide you in the right direction so that your accounts can end up with the right balance. You can add your accountant to your books by following the steps here. You can also find an accountant that has experience using QuickBooks near you by clicking on this link.
Feel free to reach back out here if you have any other questions.