Partial Images can be distorted using the Freehand Distort Tool in your Tools Palette.

To do this, simply follow the steps below:

1. Select the Origin Tool in the Tools Palette. 
2. Click on the Partial Image you want to distort in the Design Window. 
3. Select the Distort Tool in the Tools Palette and drag a box over the Partial Image. Nodes will appear around the image. 
4. Distort it by adjusting the nodes.