Sometimes, the shape you want isn’t included in the built-in or default shapes. When that happens, you can merge shapes to get a new shape. You can also use Edit Points to change a shape into the shape you want.

Merge shapes

1. Click the shapes to merge.
2. Click File > Merge Shapes, and then pick the option you want

Use Edit Points to change shape

1. Double-click the shape to change.

2. Under Drawing Tools Format tab, click Insert Shapes > Edit Shape > Edit Points.

3. Drag the black edit points to change the shape. Use the white square edit points to change the curvature of the line between two black edit points.

It’s easier to use edit points if the shape doesn’t have any fill or style. Add any color fill or effects after you have finished.

Tip: You can watch a video showing the different ways to use edit points. Although it was created with an earlier version of PowerPoint, it’s quite detailed and the process is the same.

Reuse your custom shape in another Office app

If you want to use the shape later, right-click it, and click Save As Picture.

To insert the picture in a different app, click Insert > Pictures, locate the picture, and click Insert.

Source: Microsoft