Batch layer editing

Hey guys,

I apologize if this question has been asked in the past, but my searches have left me without any results. I do a lot of work for an HVAC company, and a lot of our projects require hundreds of drawings. We don't have any set layer standards, as some of our major clients prefer different formatting. This is made worse when one of our clients changes their mind about the thickness of something in the drawing (i.e. equipment). My question is whether there is a way to, or if someone has written a LISP program to, modify a layer found within dozens of drawings without tediously having to sift through each drawing and changing the layer colors individually.

Thanks for any help

Please take a look on this thread.

Regards,