Defining an Output Using an Entity Set
Using this method, the output can be measured for all entities of a certain type that are currently present in the model.
- Select Entity Set from the Ouput Method drop-down menu.
- Select the desried entity type from the Entity Set drop-down menu.
- 
                Click the Ref Marker collector and select a reference
                    marker for the outputs from the modeling window, or
                    double-click the collector to display the Model Tree
                    (from which the desired reference marker can be selected).
                The default marker is the global frame.