Draw Trench Network (Plan View)
This command draws a trench network structure on the screen, based
on the Plan View Label Setting command and the trench network
structure data in the .sew file whose name is as same as the
drawing name. If Takeoff couldn't find such file in the same
directory where the drawing locates, nothing would be drawn on the
screen.
Prerequisite: A open drawing
Keyboard Command: plan_trench