SmartArt graphics in PowerPoint are so versatile — once you insert a SmartArt graphic (or convert some bulleted text to SmartArt), you can add more shapes with just a click or two. This lets you expand your graphic as required. You can also go in the opposite direction and delete shapes from any existing SmartArt graphic with the same ease.
Learn how to delete shapes from an existing SmartArt graphic in PowerPoint 2011 for Mac.