The same stock number (SKU) for original and duplicate products

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Since I don’t have many items, I've duplicated the same products to make it look like there are lots of items in my Shopify store. I need my inventory to match across all the same products that hold the same name/SKU number. So if a customer were to buy from one listing all the other listings would minus in stock levels too.


What's the easiest way to implement that? 


Thanks in advance :)