I was importing IIF file from payroll into QB desktop but converted to QB online. How do I import IIf files into QB online?
Let me share some information on how to import the IIF file to QuickBooks Online, @tghclu.
At this time, you can only export or import IIF’s in QuickBooks Desktop. Also, please take note that you can't use IIFs to export payroll data from QuickBooks Desktop to other products. See the following article to learn more about IIF import and export limitations: Export, import, and edit IIF files.
However, you can check apps.intuit.com for any supported third-party app that can successfully import IIF files into QuickBooks Online. Check this article: Find apps.
Also, here's a list of articles of other things you can import in QBO: