To select only those Processes or data groups that are part of the Release or Count Session, right click on the Function Tree and Data Tree and select "Flag" - "Session Impacted". SCOPE will highlight (Flag) all nodes that are impacted by the selected Count Session or by the Release if "No Session" is selected.
Highlight the Attribute on the LHS Attribute tree and Right Click, select "Link" - " To Flagged Nodes".
To understand more about Numerical Categories and Numerical Attributes see: Setting Up Numeric Attributes for Reporting
PRESS F5 to recalculate Numerical Attribute Results