Multiple suppliers for each product

New Member
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Hello Shopify community. 

I'm building a website for a client who uses a number of suppliers and makes purchase orders to them regularly. If one supplier doesn't have an item in stock they use a backup supplier. Does anyone know of an app that allows each product to have more than one supplier attached to it and allow us to make purchase orders? I've found apps like Simple Purchase Orders that will attach a product to one supplier and lets you do POs like that but nothing I can find will allow you to attach more than one supplier to any one item. 

Thank you for your help.