Suniga- Scissors Tool

The Scissors tool can be used to split paths, shapes and frames
and to reshape them.

Look at the illustration. That used to be one square which I then
cut with the Scissors tool. This is how I did it: First I selected the
 Scissors tool. Then I clicked on one side of the square, right on
the stroke, than I clicked on the other side of the square. That gave
 me the result you see in this picture (I moved the upper part of the
square away from the lower part so that you could see the cut better.)

Here I have reshaped the square using the Scissors Tool to cut
 a curved piece out of the shape. With the Scissors Tool I have
 first clicked on the stroke (outline) of the square. Then I clicked
again lower, on the stroke still, and holding down the mouse
button, I have dragged towards the right.