I am in the process of trying to list a new product, a larger size of a product I am currently selling. This new product has a new barcode that has never been used before on Amazon or elsewhere.

For some reason, when I try to create the new listing with my barcode, it is conflicting with the smaller size product that I am currently selling and it is creating a new version of the listing listing with the same ASIN from the smaller size product.

I have reached out to Amazon seller support but they have been unable to resolve the issue. Does anyone have any insights on how to unlink a barcode to an old listing that is a smaller size version of the barcode? I own the GS1 barcodes and the brand, and am the exclusive seller of both items. I have shared this info with Amazon seller support as well.

Thanks!