Sync products reduce inventory first from Product 1 and then from product 2

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Hello, I need to sync the stock from product A with product B and product C. Product A needs to be the sum of stock from product B and C. When a order is made for product A I need to reduce inventory first from product B and when it reaches 0, the next orders reduce inventory from product C. Is there an app that can help me with this? Thanks! 

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