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See if this code can be of some help... https://forums.autodesk.com/t5/visual-lisp-autolisp-and-general/polyline-2-countour-lines/m-p/8824932/highlight/true#M385912

Big up to you, the problem was from Font, I changed the Font to Arial and Standard style, then the explode command worked correct. Thanks a lot.

For my five cents worth I worked for a company and we wrote and sold a simple architectural add on prior to Architectural desktop it took around 2 years to write it to a sellable product it would do simple house plans in 3d, multiple wall styles internal-external, roofs, doors, windows, stairs automatic dimensioning etc Here is the start up menu with a wall input example the answers were saved into the drawing. Search forums etc there is a lot of free stuff out there.