Cart - Getting buyer's details for each product quantity

[OriyanJ]

I'm currently working on a Tour shop. Each product represent a tour, the quantity represent a tourist.
What I'd like to do might be complicated -
I want the shopper fields to update with each product quantity, such as this:



Whenever buyer choose 5 products, he will fill his friends details. 5 tours (products) means 5 people on it.
Doesn't have to be quantity related, could just be a separate option that will fit into order's details.

Haven't found an extension for that, I guess it would drag me through some core hacking. Any suggestions or experiences?

[Studio 42]

Hi,
This is not a typical userfields plugin, but a product customfields plugin because this have to be associate by product.
I have do many customwork on custom fields, if you need such a plugin contact me.
Patrick K