Define Object Relationship on WYSIWYG reports

I wanna design some report in IT architecture mapping (model is shown below). But I wanna try to create the report with the design view (WYSIWYG reports) because it's seems easy to use.

So far here's the report that I designed based on this tutorial. Unfortunately, I don't seems to find a relationship between objects on data field (image below is what I created so far).

And I expected the output like the excel below (with merged cell).

I am clueless about this, but I think this feature will helped me a lot. Is there any explanation on how objects relationship is work?