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On Amazon, Products have variants such as sub-Products. For example, a T-Shirt in different sizes and colors, are grouped thanks to relations.
 
Relations are used to help customers easily find, compare and buy different Product variations.
 
Relations are used to update only the variations defined on Amazon. This does not alter the Product or Offer details.
 
For example, if you are selling T-Shirts only in White (color) and Small (size) and subsequently you wish additional sizes and colors. Your Product remains the same but the additional attributes, will be added to this Product:
 

 
By clicking Send Relations only, only the relations are exported to Amazon. So relations are updated from Feed.biz on Amazon. The Product or Product attributes, inventory, Price, discount and taxes are not updated on Amazon.