Hi everyone, where/how can I activate this kind of aggregation of different dimensions?
This is called Cyclic Group concept, for more details follow below:
Using Cyclic groups in Expressions
I am not sure if I understand you correctly from the screenshot that you have attached but are you asking about cyclic group of dimensions?
You can create those in the dimension tab of any chart object(see below).
Hope it helps.
Retrieving data ...