Let's say i wanna sell a combination pack of product 1 + product2+ productN…With the ability :
to refer to these products, being able to incorporate them or change the combination on the fly


to make some calculation (ex : P1+P2 price = (P1 price + P2 price)- X%(P1 price + P2 price) where i could set the operators
To summerize impact on sales on single products : of course i sold a combo pack but i would like to know  if a product was sold in a combo…

A regular database would do that, but i suppose this is not so easy with php-sql…Anyway you can think about it…