I have searched and have not found this answer.  I have several products that inventory by each but purchase by a package, with different amounts per package.  UOM seems to be a global field so I can't set the ratio for package to each at 5 for 1 product and 10 for another product without crating a separate entry in the UOM table for the ratio.  If I do that and call them all each there is no way to tell the difference when adding them to a product.  Is there another way to do this?  This is not for the same product it is for different products.