We all know that the offers Business Central (BC) provides out of the box work with SKUs. Let's refer to a particular SKU as /x./
We also understand that you can create as many barcodes as you wish (let's call them /a,/ /b,/ and /c/) and link them to the same SKU (/x/). In doing so, when you scan any of these barcodes, the same SKU (/x/) will appear in the POS system. Essentially, barcodes (a, b, c) are associated with SKU (x).