Hi there, @haixvo.

Thanks for joining us here in the Community. I'd be happy to share with what does the batch action in QuickBooks Online is all about. 

Batch action allows you to print, email, and enter transactions in bulk.

To learn more about how to perform the action, please check out this article:

• Enter batch transactions.
• How to email or print multiple invoices and sales forms at one time.

You can also check out our QuickBooks Online tutorial for more information on some QuickBooks features and its functions in QuickBooks:

• QuickBooks Tutorials.
• All QuickBooks Tutorials.

That should do out!

Please know that the Community is just around the corner if there's anything else you need. Have a great weekend!