I can provide information about the class tracking feature in QuickBooks Online, TN-landlord.

This feature helps you track income, expenses, and profitability by segments. 

Using this feature helps you organize your customer and vendor transactions by class. You can also run reports by class to check the sales and expenses. Then, you can also create a budget for each class. This lets you plan and set goal for each segment in your company. I've got the article for more information. 

If there's anything else you need, please let us know. We'd be happy to help you.