Add product alter units (or packages)


I need some help about the best way to add alternative measurement units (unit packages) to our products.

The scenario:
There is an online store that sells lubricants (motor oils), so we have a product named "Lubricant Sample SAE 5w-30 1lit.".
The default unit is the "piece" (1 piece = 1 unit), but the store also sell that product to a carton "box" (or package) that contains 12 pieces (1 box = 12 units) and of course to different price (usually price = unit price x units).

Is there anyone who know how is the best way to implement that?

I have attached an image from another e-shop (non drupal project) where the above scenario works.

Thank you in advance.

Image icon product-with-alter-units.jpg110.58 KB
Posted: May 16, 2013