Use a product like other product attribute

[tato_6_6_6]

Hi, first of all thanks for vuesto time. Now I will try to explain as best as possible. My product is selling and anccesorios josytick use prestashop 1.6. (Www.nsdp.es). While the matter is that I have a joystick sold loose without the top ball, but I want to put as attribute these higher ball joystick is itself another separate product on the page. I am seeking a way to do this so that if someone buys a joystick this ball is free and most importantly, the remainder of the stock of the product, I hope you can help me greetings and thank you very much. and sorry for my bad English

[PascalVG]

Maybe make a cart rule, where you add a free gift to the cart when the customer add a specific product to his shopping cart?

http://doc.prestashop.com/display/PS16/Cart+Ruleshttp://doc.prestashop.com/display/PS16/Cart+Rules

 

My 2 cents,

pascal