I need to be able to sell drinks either by the bottle or by shot. In the POS, the two should appear under different POS categories (eg. drinks/bottles/brandy and drinks/shots/brandy).

From a procurement POV, a drink like PQR (don't want to advertise any particular brand) should be treated as a single product, always procured by bottle.

I've set up shots and bottles as units. But now how do I proceed? I cannot create a single product with multiple units of measure. And cloning the product results in me having two different products, each with its own procurement, which is not what I want.

I've tried searching around. The OpenERP 6 book does mention package management, which seems to be what I want. But I can't figure out (1) whether OpenERP 7 has this and (2) if it does, how to configure it. Searching Apps for "package" or "packaging" doesn't return anything and searching $SEARCH_ENGINE gives a lot of hits relating to package management as in .deb, .rpm, not relating to package management on products. I might not know the right search terms.

Do I need to install something to get package management? If so, what? Does package management even allow me to do what I need?