It's good to know that you have updated your file to QuickBooks 2018, CT Tim.

I can see how beneficial it would be to your company to have a technical support for importing IIF files. That said, I'll take note of this idea and shared it with our Developers team.

For more information about importing IIF files, you can visit this page: Export, import, and edit IIF files.

Don't hesitate to reach out to me if there's anything that I can help. Keep safe!