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With our class tracking feature in QuickBooks Online, you can run reports to see your income, expenses, and profitability by segment. An outstanding invoice isn't trackable this way, however there's a wide variety of reports included with your subscription. One of these is the Open Invoices report, which will show ones that are unpaid. This can be generated as a workaround to obtain what you're looking for.
Here's how:
1. In the left navigation bar, go to Reports.
2. Enter Open Invoices in the Find report by name search field.
3. Click Open Invoices from the displayed drop-down list.
You can also use the Customize button to filter by a specific customer/set of customers, distribution account, terms, etc.
Here's a few resources that may come in handy moving forward:
If you have any questions, I'm just a post away. Enjoy the rest of your day!