However, Excel lacks commands for creating a third secondary axis. One workaround for this shortcoming is to swap the X and Y axes of several pseudo data series to yield a chart with multiple Y axes.

Excel automatically distributes these points along a uniform X axis. To add more data to the Y axis in a line chart, add additional numbers in cells below your existing data.

In Microsoft Excel, to draw attention to a specific marker in a line chart, drop in a thin line, think of it as a marker.