If the integration is active from Harvest to QB and the customer is billed in USD, would QB convert that to INR ? A copied invoice has converted at exchange rate 1.00

Welcome to the Community, qb-nilenso-com. 

I can help share some information about the converted exchange rate in QuickBooks Online. 

When you turn on multi-currency, QuickBooks uses the home currency of your foreign currency transactions. For more details, you can check out multi-currency FAQs for frequently asked questions on this.

Also, check our multi-currency-related articles for additional reference:

• Frequently Asked Questions about Home Currency Adjustments.
• Enter home currency adjustments for your foreign balances.

If you have any other questions on this, please add them below. The Community is always here to help.

@qb-nilenso-com 

Another option, utilize this app to deal with multi currency transactions. You can accept payments in USD and convert the balance to INR anytime you need.

https://wise.prf.hn/l/64dl92k