Can you be more specific about your requirement "Free shipping product + non free shipping = Free Shipping". I'm afraid that I couldn't get it right. Btw try to take a look at this article on how to create a free shipping discount on Shopify, or I suggest you to use apps like Discount Code Generator or Free Shipping Bar.
Hope it helps!
Dear Jason , thanks for replying ,
i will describe my problem :
i have a free delivery offer in my website for products that are coming as a package , and there is other items that are having a delivery fee , now what i want to achieve is if customers are going to buy a package from my store along with other items is to make the delivery for free (exclude shipping fees if there is a package in the order ).
i hope this is understandable now .