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 ...

If you instead make a chart from multiple rows and multiple columns, Excel will make one dimension the x-axis and make the other into different series.

How to Have Three Secondary Axes on Excel 2007. Excel 2007's secondary axis feature enables you to view two different data series with two distinct scales, all on the same chart. Use this feature ...