Magento - Free product when purchasing a different product

Question

I want a specific product to be free when added to the cart along with another product from a chosen category.

I've added the conditions below, but in actions I cant find an option to apply the 100% discount to a specific SKU, only products in a specific category or attribute set.

Does anyone know how I can do this? Thank you

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Example

If a product in the cart is from category 3, then discount product with SKU 'blah' by 100%

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Condition

If ALL  of these conditions are TRUE :
    If an item is FOUND  in the cart with ALL  of these conditions true: 
        Category  is  3  

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Action

Answer 1

First of all you have to be sure that the SKU attribute can be used for the Promo rules creation. To do this, go to Catalogue/Attributes/Manage Attributes

and edit the "SKU" attribute, setting the "Use for Promo Rule Conditions" attribute to YES

Then you can create such rules in the "Shopping Cart" price rules, with this conditions:

Where "42" is you category with id: 3

And the following actions:

Where "Francis-orange" is you product with sku "blah".

In this way you will see the subtotal applying the 100% discount for the "blah" (Francis-orange) product.

Hope this helps!