Thank you for reaching out to us, @manishk-dad.
I'll be glad to help you with your invoices concern.
Yes, you would need to create a custom tax in QuickBooks and it depends upon the rules, you'll need to create a group rate.
These settings are in Taxes and then Add tax menu.
You can also check on this article: Add product and service items to QuickBooks Online for additional information about adding product and service items to QBO.
We're always here in the Community to help if you have other questions related to QuickBooks. Stay safe!
