To do Alt + H + C + I on Mac in PowerPoint, download and install Accelerator Keys, then press Option, followed by H, C, then I.
Command: Duplicate
This is how to do Alt + H + C + I 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 + C + I duplicates the currently selected content, creating an exact copy immediately. Unlike copy and paste, duplicate creates the copy in one step, typically placing it slightly offset from the original. This is useful for quickly creating copies of shapes, text boxes, or other objects on your slide.