Located this reply from kgrunawalt at Autodesk development.
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Reply From: kgrunawalt
Date: Jun/06/06 - 09:58 (CDT) NEW!

Re: BOM Parameters
I'll speak to the QTY as seen in the BOM. This is not a parameter. It is a total calculated per row in the bom view. A BOM with 5 different parts will have 5 different QTY values.

I think you want an excel like equation that references values relative to a row. Then you could do ITEM QTY * cost and ITEM QTY would have a row context. This is not supported in the current BOM or parts list. You are not the first to request the ability to calculate total costs. I will make sure this need is logged.

Katrin Grunawalt (Autodesk Dev.)