Hello Gary,
You are correct, it's not your live project. It's a reference project that Apptio builds out as an example of a completed project, with sample data. In here you can see samples of OOTB reports, the required data set and sample relationships between the data sets. You can also looks a the tables to see sample formulas and which data sets are appended into the Master Data Sets.
The course most tied to this information would be the Intro to CT course and the subsequent backpacks with all of their related videos. It doesn't explain the relationships in this project specifically but that course is where you build out a sample CT Foundation project, and learn all of the things you could review in this project.
The reports in this project are the same reports you learned about in the CT Reports and Users course. This means that if your production project isn't complete yet, you could use these reports to start familiarizing yourself with where to find what in the reports. It won't be your data, but it will get you familiar with the flow of the reports and more comfortable finding answers in the OOTB reports.
I hope that helps a little.