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Hi All, I hope this is the right approach to my problem - I have searched the forum (and the net) a few times but am yet to find a solution. First and foremost - I am using AutoCad 2014 on a Macintosh...what I would't do for laydel... I work within the Entertainment Sector for a promoter. We regularly receive plans from external sources, many of which are in pretty poor shape. I am required to strip these down but find this very difficult when there are many blocks within the drawing with their layers not set to 0. e.g I am currently stripping down a venue plan, with over 60 blocks, all with different layers. I cant delete the unnecessary layers without changing the layers within the blocks. This is VERY tedious manually. I am hoping someone can help me with a lisp routine to do this automatically. I have been following a thread: "http://www.cadtutor.net/forum/showthread.php?19161-lisp-for-changing-all-objects-in-a-block-to-layer-quot-0-quot/page3" but am unable to get the lisps offered to work (though the one by kpblc seemed to get the closest) and am wondering if this is because I am using Mac? My understanding is that Mac has issues running anything other than AutoLISP? Any help would be appreciated. The thought of doing this manually again is just a little overwhelming and its an issue I am going to continue facing. Cheers, David