We recommend that you reconcile the QuickBooks desktop on a regular basis to ensure the accuracy of your accounting data. Here are some easy steps of how to void a check in QuickBooks Online: Open the QuickBooks online accounting tool (software) Click the Accounting tab at the top left corner. Step 2: Add An Opening Balance (optional) You can add an opening balance for pre-existing customers. Hope this helps! It’s usually easiest to start with your checking account. The steps are as follows:- In QuickBooks, go to the left side menu. Opening balances for other Balance Sheet accounts … Then, you need to choose the Account history of the chosen account. Step 1: Tap on Chart of Accounts which is located under the Lists. Click the first entry in the register and then click 'Go To'. Find the opening … Click on the Reports option.