To do Alt + H + T + 1 + A on Mac in PowerPoint, download and install Accelerator Keys, then press Option, followed by H, T, 1, then A.
Command: Add Section
This is how to do Alt + H + T + 1 + A 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 + T + 1 + A adds a new section at the current slide position. A dialog will appear prompting you to name the section. Sections help organize your presentation into logical groups, making navigation easier in large presentations.