lisp question

Have you considered a simple command call to CHANGE to do the job?

taiken a écrit : hello,
there is no group 6 if the linetype is "bylayer" ... you must use append instead of subst :
(setq get (entget entity) get (append get (list (cons 6 "hidden"))) ) (entmod get)
"hidden" typeline must be loaded in the drawing
philippe

Good idea Mike --simple and straightforward-- in this instance I can use the change command. What I'm working on however will be better served by Phillippe's approach. I am drawing ductwork using an Autocad add on called Intelicad (note only one L). Its a great program by and large but I'm working on tweaking its ability to hide the duct in instances where one run is only partially hidden by the run above it. It involves exploding blocks representing the edges of each piece of duct, changing the resulting pline to linetype hidden then redefining the blocks to maintain consistency within the program. It will save me alot of drawing time once I get it working properly. Thanks for your reply. Tim

Phillipe, your reply is precisely what I was looking for. much thanks, Tim