How to Merge Shapes in PowerPoint
You don’t have to settle for the basic shapes PowerPoint offers. You can easily modify shapes to create a unique shape that’s all your own.
Every shape is formed by a series of points. These points can be manipulated to change the shape’s form.
Now you can see the points that make up the shape's boundary. Each of these points are editable.
You can use the Merge Shapes feature to create new, custom shapes from one or more existing shapes.
The merged shape will take on the color of the first shape selected, so if you want to keep a particular color, be sure to select that shape first.