Plot Partial Dynamic Response
You need a dynamic analysis with results to complete this
            task.
        - In the Project Tree, select a Dynamic analysis branch to open the Analysis Workbench.
 - 
                On the Analysis Workbench
                    toolbar, click 
 (Results plot).
             - Select Displacement Magnitude from the menu.
 - 
                On the Analysis Workbench toolbar, click 
                    (Pick info).
             - 
                In the dialog, pick a point and plot the dynamic response.
                A Dynamics frequency response (Point) dialog will open showing the plot of the chosen point.
 - In the dialog, pick a point on the curve to show the Modes contributions into response table.
 - 
                In the table, select rows to choose which modes to include in the partial
                    response.
                Tip: You can sort the table by clicking on the column headers.
 - 
                 Click Evaluate response.
                The plot in the dialog will update to show the partial response.