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From: "Bob Paddock (graceindustries AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Date: Fri, 1 Dec 2017 12:54:06 -0500
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Subject: Re: [geda-user] Including parts in a BOM that are not on the board
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On Fri, Dec 1, 2017 at 12:05 PM, James Battat (jbattat AT wellesley DOT edu)
[via geda-user AT delorie DOT com] <geda-user AT delorie DOT com> wrote:

> Do you have recommendations for how to incorporate components into a BOM
> that are not part of the netlist or board layout?.
>was thinking of creating a separate .sch file, e.g. "peripherals.sch" and including it in the BOM generation but not when I "import schematics" in the layout...
>But am curious to know how others handle this.

By not doing it.

The BOM should drive the project of which the schematic is a part, not
the other way around.

In a production/design environment you do not want to have too touch
drawings because some vendor obsoleted PartNumber and replaced it with
PartNumber-A.
This would get really problematic with hidden attributes when visible
dates don't match what might be on a audit record.

The argument frequently then becomes "don't change the visible date"
which later bites you when they *look identical* yet they are
different.
This can get expensive if someone updated the PCB revision, someone
had the old document  (.sch) with the old  PCB rev and same date and
then order out of date boards to the tune of tens of thousands of
dollars, based on the hidden attributes (the BOM in the schematic).

Always avoid having a change ripple through the design files that has
no real impact on other files, yet must be updated.