How to assign 2 or More Barcodes for One SKU?

[SupplementVault]

I am trying to implement shopify POS to my retail shop. But i am importing goods from several countries. When i import same product from different countries those products have unique Barcodes. But i am using a one SKU for all of it. So i need to assign those product barcodes for an individual SKU. And i am only using Shopify POS. And i also need to scan the barcode of those product and bill it from Shopify POS app. Please help.