When you define the part, there is a field which can be edited that goes into the description field. 

I suggest porting the BOM into Excel, and editing this field by hand, since many times you will have a particular spec for one or two parts. 

There is not a way, within Eagle, to have different descriptions for the same part, but there is a way to have different descriptions within a part family.  I actually have several parts defined within one family, such as low leakage and normal leakage capacitors, that have the same footprint and symbol, just different descriptions.  However, Excel makes this largely unnecessary.  

If you are porting BOM's, use my hack (available on the Eagle download site) called BOM2.ulp, that generates a comma separated list for better Excel import.  Others have posted similar hacks, which might suit your needs even better.

-- Lawrence Lile, P.E.
Electrical and Electronic Solutions
Project Solutions Companies
www.projsolco.com

> -----Original Message-----
> From: Roy J. Gromlich [mailto:rgromlich@mail.renaissance-tech.com]
> Sent: Tuesday, December 14, 2004 1:57 PM
> To: PICLIST
> Subject: [EE] Eagle question on Bill of Materials
> 
> Does anyone know how to change the contents
> of the DESCRIPTION field which prints in
> the BOM.ULP utility?
> 
> The Part Value is obvious and the Device and
> Package make sense, but the Description field
> is mostly blank or very generic. I would like
> to use this field for a real description of each
> part, including Mfg. and Mfg. Part #, where
> that info is significant.
> 
> I have sorted out which entries show up in the
> other fields, but I can't see where the description
> field is stored - or how I can change it.  The BOM
> ULP is not discussed in the instructions, and Eagle's
> documentation does not mention this anywhere
> that I have found.
> 
> Any help will be appreciated.
> 
> RJG
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