In AutoCAD If Lines are Non Co Planar You can't Trim it , Which Command do you use to get it trimmed?

You Can Draw a Line between them. The use the edge of the surface as a the cutting line then delete the added line

try to get them in the same plan

You Can Draw a Surface between them. The use the edge of the surface as a the cutting line then delete the added surface.

If you are using AutoCAD2012 you will find an option Called Project. when you change it to UCS you will be able to trim the lines which are not co planar...

I will use only command TRIM, before i change Start Z and End Z value to "0" in Geometry 

Check the Z position of trimmed object

Regards,

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