Pivot Chart: Expandable Rows / Group by Rows

When you create Pivot you would like to have totals per groups and be able to expand 2nd level columns to see further detail.

If I have a PivotTable which is showing information on Epic Level, I would like to expand this column so that I can see the underlying features if the Pivot has been defined like this in its datasource.

Right now we are maintaining several Pivot Charts for different detail levels.