Hello there, Roxann.
Let me share insights about including check numbers when importing bank transactions so you can manage your financial data in QuickBooks Online (QBO).
You can include the Check No column in the Banking menu to view the check numbers of your bank feed transactions. Please see the screenshot below for your reference.
However, some banks add the check numbers in the description, and it depends on them if they specify the said info separately. In this case, you can manually input the check number while categorizing your transactions in QBO.
Also, I encourage you to reconcile your accounts in QBO regularly (every month). This helps monitor your income and expense transactions and detect possible errors accordingly. You may want to check out this article as your reference to guide you in doing and fixing reconciliations in QBO: Learn the reconcile workflow in QuickBooks.
If you have other banking concerns or questions about managing transactions in QBO, please don't hesitate to comment below. I'm always ready to help. Take care, Roxann.