Apply, modify, or remove a clipping path
A clipping path is a path or shape that is applied to another object, hiding the parts of the object that fall outside the clipping path. To create clipping paths that are more complex than a simple path, ellipse, or rectangle, you can use the Microsoft Expression Blend combining tools. For more information, see "Combining paths" in Drawing overview.
Select the clipping path object.
In the Toolbox, select the Direct Selection tool. The points of your path object are identified on the artboard by small squares.
On the artboard, use your mouse to drag, or ALT+drag, individual points and line segments to new locations. You can also select the Pen tool to add or remove points on the path. For a list of the different ways that you can modify a path, see Pen and direct selection usage.