Good afternoon, @cmambern.
Thanks for reaching out to the Community. I'd be glad to provide some insights into cross-reporting.
You can export the reports to Excel and combine them from all of the different companies there. You can refer to this article as it has further information with exporting reports: Export your reports to Excel from QuickBooks Online.
For additional information on converting from QuickBooks Desktop to QuickBooks Online, here are several articles you can refer back to as well:
- Move your QuickBooks Desktop file to QuickBooks Online
- What to expect when you switch from QuickBooks Desktop to QuickBooks Online
At this time, QuickBooks Online doesn't offer a feature that allows you to cross-report from one account to another. Rest assured, I'm going to pass along your suggestion regarding this.
If you have any more questions or concerns, I'm always here to help. Have a safe and productive rest of your day!