I can share some information so you can track costs by project, @Andrew Keywood.
After turning on the Project feature in the QuickBooks Online, you can create a dummy customer. Adding a customer’s information is necessary to track a specific job.
Here’s how:
- From the Sales menu, choose Customers.
- Select the New customer button.

- Enter dummy information in the fields then Save.
After this, you’ll want to attach it to the project and then create transactions to track the costs. Once you’re able to recognize the customer, that’s the time you can edit the profile.
For more information about the setup and how to use the project to calculate your profits and costs, you can check this reference to track them.
Tag me on this page if you have other concerns with QuickBooks. I’ll be more than happy to take care of them for you.