That sort of works.
In this chart I have created a dimension that is based on the selection from a listbox. So depending on what they select it shows a different set of dimension values with the metrics for that value.
Is it possible to modify your expression to also Aggr based on the selected dimension using a variable?
The variable I have is vDataDisplay and is equal to =$(='[' & only(Dim1) & ']')
Dim1 comes from an inline table based on the selection from the listbox.
I really hope the answer is Yes.