Exend line by distance´Ù.
 
  Program name : LINEXT.LSP

  Sometimes you want to increase the length of a line by some amount. Of course, using the temporary line
You can do it, but you can use this program to stretch a lines as you want at a time.

 
 Example
Pick endpart of line : (nearest of) {p1}    [Pick end point of line]
Distance to extend : 500               [Enter extension length
                                        Dashed line is extended part at image below]