Glad you made it here, ashish91tulsian.

I can help share some insights concerning exporting invoices in Quickbooks Online. If you're referring to export your invoice to Excel, you can follow the steps below:

1. Go to the Reports tab.
2. Enter the Invoice list in the search box, then enter. 
3. Customized the Report period and hit Run report. 
4. In the reports page, click the Export button then select Export to Excel. 

For more information about importing or exporting data, you can check out these articles: 

• Export reports, lists, and more
• Common questions about importing data to QuickBooks Online
• Export customer data to Excel

If referring to something else, please do add a comment below. I want to make sure everything is taken care of for you.