Drill down two visuals

I like that functionality but from my point of view the explanation in the Docs is not 100% clear.

I would recommend to read the link provided in the solution and remember those main steps:

1) in your visual, drag and drop a field to the drillthrough target (same field as in your visual, in my case the month field)

2) Power BI will automatically create a "go back" button in your top left corner, you can cut & copy that button to your drill-through page

3) create a new page (you can make it hidden) with your new chart

4) drag and drop the same field, same as you used before, in the drillthrough of this new page. Do the step 2)

5) Power BI will take care of the automatic filters 

You can now go to your visual and right click - drill through

p.s. in the docs page, there is a link to another page which shows how to create buttons for the drill-through - have a look at it!