working with variants to show what sizes are available for a product

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I have a shopify store, using pixel unions "superstore theme". I have a number of similar products with different quantities. For example a multiple vitamin that comes in a 60 and 120 size every thing else is similar. the two products have different upc codes and different handles. I want to show on each shopify record that both records are available in 60 and 120 sizes. Can I do this with the Shopify csv file or some App. Any help would be deeply appreciated.