DIVIDE allows you to trim or extend an entity (excluding
circle) into two separate entities by selecting the 
portion of the entity that you want to remove. This 
function is view dependent.

If desired, you can pick the same entity twice.

Select an entity on the side that will be removed when the
entity is divided.

Select the first trimming entity, near the intersection 
with the entity that is to be divided. Remember that at
least one of the selected trimming entities must intersect
the entity that is to be divided.

Select the second trimming entity, near the intersection
with the entity that is to be divided.

The 2-D intersection is computed, and if an intersection
exists, the desired entity is divided so that the portion
between the intersections of the two trimming entities is
removed, and two separate entities are created.

If the trimming or extending is not correct, press 
(Alt)-(I), or click on Undo in the break area to erase 
the trim or extension.
