Create a group/collapse in a spreadsheet

Hi Idrissshatila 

Thank you for your answer. 

First, this proposal is really good, however i have a problem.

I have created all the groups that contain the values that's ok. 

But, right now, I can't do a top hierarchie or the dynamic slicer. 

I mean, the dynamic slicer doesn't display properly because the filter doesn't work. 

When I click on  the filter "A DATE" for exemple, all the data remains displayed rather than displaying only the "A DATE" data. 

Is it normal? I don't think so...

Here this is my result :

I have created a new parameter with all these news parameter. I thought it was interesting to make this dynamic slicers 🙂 

Thank you in advance, 

LD