To do Alt + H + N on Mac in PowerPoint, download and install Accelerator Keys, then press Option, followed by H, then N.
Command: Numbering Menu
This is how to do Alt + H + N on Mac in PowerPoint with Accelerator Keys, the native ribbon and alt key shortcut solution for Mac users who get more done with PowerPoint.
Alt + H + N opens the Numbering menu, displaying various numbering styles for creating numbered lists. Choose from Arabic numerals, Roman numerals, letters, and other formats.