Dynamic Legend Switch: Toggling between Detailed and Aggregated views without Bookmarks

AlonCarmel 

If I understand your requirement correctly, then the easiest way to achive your requirement is through a custom column or by creating a group column

https://learn.microsoft.com/en-us/power-bi/create-reports/desktop-grouping-and-binning

I would suggest you to create a custom column in power query which categorizies 8 individual categories in 3

Create a field parameter table with the actual column and also the custom column. Place the field parameter column in to your visual. Then  you will be able to switch between the summary view and detailed view.

Hope this answers your question 

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