Product cost rules

[Jennifer Weston]

I'm trying to figure out how to define product cost rules for  
products. It looks like I may be able to set up something with  
ProductPriceRule, ProductPriceCond, and ProductPriceAction, similar to  
how I have price breaks for the same products. The problem I'm running  
into is how to make a distinction between the price rules for our  
customers and price rules for our company's purchase orders going to  
our vendors.

Does anyone have any experience with this sort of scenario?