Step-by-step instructions and best practices for connecting several QuickBooks Desktop company files that live on the same Windows machine.
Open the first company file in QuickBooks Desktop
Run the QuickBooks Desktop setup flow for your integration
Repeat for the remaining company files
The Web Connector after creating multiple separate connections – one per company file.
Why is this blank QuickBooks window necessary?
QuickBooks Desktop showing the required "No Company Open" window.
Technical performance considerations