HI there, Foamroof.

Thanks for dropping by the Community, I'm happy to help you out. Can you clarify a little further so I can understand fully, when you say you have 2 different company files in 2 different versions of QuickBooks. What versions are you referring too? I ask because if you mean you have one with QuickBooks Desktop and one with QuickBooks Online, the login page would be different which would cause the issue you're referring too. If you'd like, you can reach out to our support team in the meantime and they can guide you through the set up of both company files so you can achieve exactly what you want. Otherwise I look forward to your response down below. Thanks for your time and I hope you have a lovely day.