How can i upload the bills batch format in QB online in item format.

Hello there, Hafiz.
 

Currently, the option to directly batch upload bills in item format into QBO is unavailable. As alternative, I suggest exploring third-party applications that integrate with QuickBooks to handle this process efficiently.
 

If you have any other concerns, please feel free to reach us out.

@Hafiz-Muhammad--Shahzad 

You can use an importer tool.

https://get.transactionpro.com/qbo