Fulfill Order by Splitting Packs

This plugin allows a customer to order more items than those currently in stock by adding items from in-stock packs to the quantity available for that item.
Requires Hikashop custom fields on the product table with the following column names:

• product_bfsplitprodpacks4order_code
  This is the pack product code.
• product_bfsplitprodpacks4order_qty
  Number of items which can be split from the pack.