Hello there, changalang55.
While the option to combine reports within QuickBooks Online is unavailable, you'll want to customize and then export them to Excel and collate it from there so you can clearly compare them.
Here's how to pull up the report and export it:
Do the same thing for your Balance Sheet report. For more details in customizing your report, you can click here.
Feel free to post your questions here if you need anything else. Take care!