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.

This article explains how to add a secondary axis to a chart in Excel so you can view unlike categories on the same graph. These instructions work in Excel in Microsoft 365, Excel 2021, Excel 2019 ...

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.