Once you insert a SmartArt graphic within PowerPoint (or convert some bulleted text to SmartArt), you may want to add more shapes to your SmartArt graphic. Fortunately, you can make these additions and later edit them too. You can add more shapes to your existing SmartArt graphics either from within the SmartArt graphic itself or through the Text Pane. Note that adding a new shape to a SmartArt graphic entirely depends on the SmartArt variant that you are using; some variants offer more options than the others.
For more details, choose your version of PowerPoint:
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