Splitting a Custom Column Chart Bar Into Units

Hi Chemkhi 
The bar tooltip has the same filter context as the bar itself.
If it is only months you will see the month's qty.
If you want to split it by another filter context for example business units, you can create a customized tooltip.
For more information please refer to the linked tutorial:

https://www.youtube.com/watch?v=cGpBUJpFWrM

If this post helps, then please consider Accepting it as the solution to help the other members find it more quickly

Hi Chemkhi 
As I mentioned in my first response you need to create a desired tooltip 🙂

You can format and design it better than me, I just put the data of the basic table to let you see what I am talking about.

From this point, you can use a tutorial that I linked in my first response.

Pbix is attached

If this post helps, then please consider Accepting it as the solution to help the other members find it more quickly

You can make this "window" larger, 
just customize the size from here:

Remember that you don't have to see all rows in the visual when you design it because on the bars hover it is always filtered by the bar's context.

If this post helps, then please consider Accepting it as the solution to help the other members find it more quickly