Let's make sure you'll be able to see the Profit and Loss by Class report in QuickBooks Online, HollyJoy.

Classes consist of a freeform list you can use to tag your transactions. You'll have to turn on class tracking so you'll be able to view the report. To do this, follow the steps below:

1. Click the Gear ⚙ icon and select Account and Settings.
2. Select Advanced, then select the Categories section to edit.
3. Check Track classes.
4. Check Warn me when a transaction isn't assigned a class. This is optional, but it's good to turn on, so when you look at reports, you know everything got classified.
5. Under Assign classes, select One to entire transaction or One to each row in transaction.*
6. Click Save, then Done.

Then, you can set up your class list. Once done, you can now run the Profit and Loss by Class report. 

Additionally, to make sure that you'll get the information you need, I've added this article for your guide: Customize Reports In QuickBooks Online.

Please reach out to us if you have any concerns about classes. We're here to help you.