Variant objects are created and stored in the same folder as their primary object. The variant object is not added directly to the book. Iinstead, it is linked to the book via the relationship to its primary object. If you're creating several variant objects from a primary object, each variant must use different criteria values.
Once the variant object has been created, you can open it in the Editor and make the required changes to the content. Because a variant is a unique object, your changes aren't reflected in the primary object or any other related variations of that object.