In my understanding, you created a product attribute named “variable” (WordPress Dashboard > Products > Attributes). Did you then:
– create a “variable product” in WooCommerce, (“Product Data” section set to “variable product”),
– selected your “variable” attribute in the “Attributes” tab
– created a variation based on the selected attribute in the “Variations” tab?
You would then find your “UPC code” variable below the “Description” field after you opened the variations you created for the product.
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