Hi Monique,
Brian's right about the term for the program you are looking for, and is also correct that MISys discontinued their version (which integrated with their manufacturing solution) because of lack of sales. By their very nature, these programs are complex and usually customized to a specific company's product range.
I'd reccomend soliciting the services of an experienced Excel guru. Otherwise, just make sure that an experienced person reviews all the quotes prepared by less experienced staff.
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Andrew Bates