CHAMFER allows you to create an angled line that has its 
endpoints on two selected lines, at specified distances 
from the intersection (or potential intersection) of the 
lines. The selected lines are trimmed or extended to 
the intersections with the chamfer line.

Define the distance from the intersection of the lines to
the first endpoint of the chamfer line.  

Enter a value greater than .00005 and less than 10,000 and
press <Enter>.

Enter the distance from the intersection of the lines to 
the second endpoint of the chamfer line and press <Enter>.

Select the first and second lines near their intersections 
with the other line.

The chamfer line is created in the plane defined by the 
selected entities.
