We start from installing an extension:
Then we define promotion. For each 5 2011 Pit Boss products bought...
... customer gets 2 free 2011 Tycoon products.
When adding five Pit Boss 2011 products to cart, two free 2011 Tycoon were added too.
After adding ten Pit Boss 2011, Tycoon 2011 count increased to 4.
When adding more products to cart, more free products will be added to order. For each part of products in promotion customer gets free products.
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