You can allocate, or set aside, a plot in the plot legend for data that LabVIEW will draw to the graph or chart, as well as customize the allocated plot.
To add a plot to a plot legend of a graph or chart, move the Positioning tool over the plot legend border. When resizing handles appear at the corners of the legend and in the middle of each border, drag a handle up, down, left, or right and release the mouse button when the legend contains the correct number of plots.
You also can click the increment arrow on a plot legend scroll bar to expose an empty plot. LabVIEW dims an empty plot in a plot legend. Click the empty glyph in the empty plot or enter a plot name to create a new plot.