PowerPoint (and other Microsoft Office programs) let you quickly duplicate selected objects using the Ctrl + D shortcut key (for Windows). Mac users can get the same results by choosing the Command + D shortcut key. These links below provide more details on using these shortcut keys to duplicate and create a patterned sequence of objects.
To learn more, choose your version of PowerPoint. If we do not have a tutorial for your version of PowerPoint, explore the version closest to the one you use.
Microsoft Windows
Duplicate Shapes Using Keyboard Shortcuts in PowerPoint 2016
Duplicate Shapes Using Keyboard Shortcuts in PowerPoint 2013
Duplicate Shapes Using Keyboard Shortcuts in PowerPoint 2010
Apple Mac
Duplicate Shapes Using Keyboard Shortcuts in PowerPoint 2011
Tutorial Code: 06 04 02
Previous: 06 04 01 Duplicate Shapes by Dragging in PowerPoint
Next: 06 04 03 Drawing Multiple Shapes Quickly in PowerPoint