Hi there lloyd-prequip-co,
Thanks for reaching out about entering opening balances. QuickBooks Online is a great tool able to help you keep track of the sales and expenses so you know the profitability of your company. I can provide some information about entering an opting balance.
To enter an opening balance, you can use a journal entry using these steps. You'll need to select to affect the Accounts payable account, with the supplier in question as the name for the line.
if you have any other questions, feel free to reach out here.