Hi,
I am a new K2 user, and i'm trying to do a product catalog with it.
i almost have done what i was looking for except one thing.
I would like to add to some of mine product some option with a value (option: size: L value: +5€ ; size XL value: +10euros)
Do somebody have a clue?

ps: sorry is my english is bad, i am french speaker :)