I can see that it's a duplicate post, @Ajay0081.

My colleague KurtKyle_M already shared his answer to your concern about exporting customer and vendor data in QuickBooks Online. You can check out his response through this link: https://quickbooks.intuit.com/learn-support/en-us/other-questions/re-export-qbo-data-to-another-qbo-....

The QuickBooks Community team is always here to help if you have any other concerns or follow-up questions. Have a good day!