Need to add invoice created from sales man app to quick books on each order the take using salesman order App

Hello nithin@pixelscri,

QuickBooks Online can integrate with a third-party app as long as it is supported. When checking the Intuit App Center, the salesman order app is not yet listed as a supported third-party app that can sync with QuickBooks Online. 

We'd recommend contacting the app support for Salesman Order App to check for options on how they can integrate to QuickBooks Online. They'll be the best support that can provide more information on the process. In the meantime, you can manually enter your invoices or manually import invoices in QuickBooks Online. Here's how to import invoice using CSV file:

1. Click on the Gear Icon.
2. Click on Import Data.
3. Click on Invoices.

You can download the sample CSV file for your reference on how to import your invoices.

Fill me in by dropping a comment below if you need more help with QuickBooks Online. I'm here to assist you. Have a great day!

@nithin@pixelscri 

What the name of the salesman order app do you have?