Hi guys.
Recentrly I've been doing some analysis on the reports our client has. And I found the following report behaviour and I really couldn't find how it was created.
Maybe you can give me some tips:
We have the following report:

On the criteria tab we have this:

That is a column group. I cant edited or check how it is created.
When we click on one of the weeks on the first image, the report displays two more fields. Giving more detail to it.

I couldn't find how to replicate this behavior and It would be great if some of you could point me to some direction.
Thank you guys.