Hi shivali16,
Welcome to the QuickBooks Online Community family! It's great you're using the Reconcile feature to ensure a match between your books and bank statements. I'll be happy to assist you with this.
It sounds like you could be talking about fixing an incorrect opening balance in your account. If that's for your first reconciliation, I recommend following the steps in this article: Fix beginning balance issues during your first reconciliation in QuickBooks Online
In case you've reconciled your account before, here's an article to help: Fix beginning balance issues if you've reconciled the account in the past QuickBooks Online
You can also access other great links in these articles to assist you with any other issues you might have when reconciling. For any further assistance, feel free to reach out to our tech support team.
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