allow to use the slicer to superpose results according to filter values, not just to combine (sum, average) them

[yannick_boissea]

allow to use the slicer to superpose results according to filter values, not just to combine (sum, average) them. I have a column with dates, another for results and another which represent groups (cities, as an example). I would like to see on the same plots the values over time for different cities (multiple lines)