Greetings, @SIGMA03.

In QuickBooks Online (QBO), the Project feature works like Job Costing in QuickBooks Desktop. This feature helps you to be organized and track all moving parts. 

Yes, you can create a dummy customer for tracking projects. QBO will allow you to do this. On the other hand, you can also use the Class tracking feature to help track income, expenses, or profitability by business segment.

To have a better view, take a look at these articles:

• Get started with class tracking in QuickBooks Online
• Track your transactions by class

Let me know if you have other questions concerning QuickBooks. I’m here to help. Have a great day!