Products with different quantity like 30/60/120ml and different strength of an individual product like 3/6/12 mg especially such type of product variants come in a medicinal category. We have given a complete custom solution on Shopify store to purchase such kind of products where the quantity and strength of the products are different and you can purchase multiple products at a time.  

 * Multiple variant selections 

 * Different quantity option

 * Multiple product order in a single cart with auto payable amount calculation