Use the Knife tool 
to cut the currently selected line, shape or group into two parts. One part is automatically selected.
Note: Any filled shapes are converted into lines when cut with the Knife. As the cut lines still have a fill type assigned to them, the fill is displayed again if those lines are joined to make another shape, or a different shape.
Select the Knife
-
In the Draw Tab
of the Design Panel 
, click the Knife 
button. -
Choose Draw > Points > Knife.
-
Press ⌘K
Cut a Line with the Knife
-
Draw a sloping line.
-
In the Draw Tab
of the Design Panel 
, click the Knife 
button. -
Drag across the line that you drew. A straight line representing the path of the cut is displayed.
-
Release the mouse to cut diagonally across the line with the Knife. The line is divided in two, as can be seen in the FilmStrip.
Select the line
Draw the cut line
Control–click to end cutting
-
Control–click to finish using the Knife. One section is selected
The Knife can also be used to cut groups. Load a design from the Design Gallery 
, then cut it with the Knife. You can now select and move some of the objects separately.
Note: Use the Knife to remove an unwanted section of a drawing, then join the remaining lines to make a single line.