Create a ClipView
ClipView lets you use an object as a "window" onto other objects. You see only those parts of other objects that are within the window. We call this creating a ClipView.
To create a ClipView
1. The window object must be behind the other objects in the ClipView. If necessary move it backwards. In this example the blue ellipse is the window object:
2. Select all the objects you want in the ClipView - see Selecting objects.
3. Choose Apply ClipView on the Arrange menu. All the window object remains visible plus those parts of other objects that cover the window object.
Movies (not working in this version)