Universal product naming/numbering?

Say you are building a machine for use in house.
It has a mix of parts that are buy outs.... and a lot of parts home made in the shop.
What methodology should one use to name or number the parts.... both buy out and made in shop?
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There's been a lot of discussion about part and product number strategies. Use Google to search the web and the newsgroups.
<%= Clinton Gallagher METROmilwaukee (sm) "A Regional Information Service" NET csgallagher AT metromilwaukee.com URL http://metromilwaukee.com / URL http://clintongallagher.metromilwaukee.com /

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