You add a real-time trend series to a trend chart to compare trend data from different logs or variables.
In WorkStation, in the System Tree pane, select the trend chart you want to add a trend series to.
On the File menu, click Properties .
Under Series Configuration Settings , click the Add button
In the object type list, select Real Time Trend Series .
In the Name box, type a name for the series.
In the Description box, type a description for the series.
Click Next .
In the Display variable box, enter the path to the variable you want to display in the trend chart.
In the Weight box, enter the line weight of the series.
In the Show markers box, select True to display a marker for each recorded value.
Click Create .
Click OK .