Hi there, benjhuncpa. 

The option to open multiple reports in QuickBooks is unavailable. You'll want to jump from in report to the other by adding a new tab in your browser. Through that, you can compare your reports by clicking each tab. 

Here's how: 

1. Go to the Reports page and open the report. 
2. Customize the report. 
3. Then, copy the URL and open a New tab. 
4. Do the same steps for the other reports. 

The Community is always here to help you if you have other questions. 

@benjhuncpa 

left side menu reports, right click on reports and open in new tab then create your report, do that for as many tabs as you need reports