It’s nice to have you in the Community space. I’d like to address your concern about importing sales orders in CSV template and converting them into invoices in QuickBooks Online.
The ability to import sales transactions in CSV template and converting them into invoices is a great idea if added to QuickBooks. I’d suggest sharing us your opinion and let our Developers know what you liked and what we can improve to make it better.
Since this isn’t available, check out some 3rd party apps that can integrate and import sales transactions in CSV template. I recommend clicking Apps in the Dashboard and type Import Transactions in the search field.
While some apps have a fee, there are also some applications you could use for free. All of these apps are available in the App Center in QuickBooks Online.
That's it. Feel free to reach out to me if you need anything else. I'll be here to help. Have a good one!