https://forums.autodesk.com/t5/autocad-forum/trimming-intersecting-lines-locks-program/m-p/5516964#M339387 <P>&nbsp;</P> <P>Hello</P> <P>&nbsp;</P> <P>The best way is to share with us the part of your DWG (in .ZIP format, attached in your next message) what we see in your screen capture : a few contours lines, a few concrete lines, etc</P> <P>with a WBLOCK command to select only theses entities ...</P> <P>&nbsp;</P> <P>Do you want to trim the contour lines "from" the concrete lines ?</P> <P>Or trim something else ??</P> <P>&nbsp;</P> Mon, 23 Feb 2015 16:18:08 GMT braudpat 2015-02-23T16:18:08Z