To do Alt + N S D on Mac in Excel, download and install Accelerator Keys, then press Option, followed by N, S, and D.
Command: Combo Chart
This is how to do Alt + N S D on Mac in Excel with Accelerator Keys, the native ribbon and alt key shortcut solution for Mac users who get more done with Excel.
Alt + N S D opens the Combo Chart menu to create charts that combine multiple chart types. Combo charts let you display different data series using different visualization styles, like columns with a line overlay for trend comparison.