Hello, I'm new to the customisation/programming side of ACAD and i'm wanted advice on what books/websites would be useful for a novice like myself........ I have a large number of drawings that all need certain layers deleting of objects and purging from the drawing. Obviously, to go into each one manually would be very time consuming and i'm sure there are more efficient methods to undertake this form of batch drawing updates. Any ideas please, I don't expect 'code' to be given me but would just like a leader/advice to get me started. Thanks, Dom