I need a delete auto generate invoices every month

Welcome to the Community, @ambika.varma1.

You're referring to deleting a recurring transaction/template for invoices in QuickBooks Online (QBO), correct? If so, this can be done in three easy steps. Here's how:

1. In QBO, go to the Gear icon at the top right to get to the Recurring Transactions. 
2. Click the Edit drop-down under the Action column, then choose Delete. 
3. Hit Yes to confirm.

To learn more about managing recurring transactions or templates, consider checking out these articles:

• How to create a recurring invoice and manage recurring transactions.
• Edit a recurring template.

Please let me know if you have any other questions or concerns in the comment section below. I'll be more than happy to assist. Have a wonderful day!