I am using zen-cart-v1.3.8a-full-fileset-12112007.
I am using this for my wholesale site.

I need help on how to setup the attributes to multiple products for a minimum order quantity.

Currently I am putting all the products in one category.

So it will be Category A --> Sub Category B --> Product C, D, E & F.
I would like to set a minimum order quantity of 20 units for Product C, D, E & F.

Anyone here can advise on how to go setup this?
Thanks.