Gentlemen: I am having a small issue with an EXCEL based BOM. It is in an exploded assembly of 17 parts. I made the BOM format by customizing one of the samples that came with Solidworks 2004. What happens is this.......when I send the drawing to a printer, it adds duplicate items to the BOM. On screen, right in front of my eyes, just after I click PRINT. If I turn off the automatic updating function this doesn't happen. But, if I use one of the sample BOM formats that comes with the program it doesn't do this annoying thing. I can leave automatic updating on and everything is fine. The help file is lacking on EXCEL BOM topics. Does anyone know what I am doing wrong? Thanks in advance. Don O.