Al, Al, Al--
That won't work. Just use a scissors and cut the shape in half! More
kidding.
Kristin --
Place Illinois on your drawing page. Surround the section of the state that
you want to modify, eliminate, or whatever. Select both objects, and then
(toolbar)>Shapes>Operations>Fragment. That should yield the entire state,
plus a single identified region as outlined by the rectangle. Delete that
rectangle, and you should see a divided state. Each region is individually
identifiable.
Hope this helps.
Wapperdude