Navigate to Administration > Inventory Configuration > Select the Variation Attributes Tab. Here, you can use the Create New Attributes button to add new variation attributes, or, select existing variation attributes from the list by using the green plus button. Variation Attributes are the ways in which a product can deviate from the parent product. For example, the parent product "Running Shoes" could be assigned Variation Attributes for size and color. Add Values to each Attribute- Click the green plus button next to the Attribute > Click Add New  Continuing with the charging cable example, values for shoe size could be 10, 10.5, 11, etc.