Documentation
ShopFeed
Per-Product Overrides

Per-Product Overrides

Set these custom fields on a product to override the Product Defaults for that product only, without a rule:

Custom FieldDescription
_shopfeed_brandOverrides the default brand for this product
_shopfeed_gtinSets a GTIN/UPC/EAN (the plugin also checks the common _gtin field used by other plugins)

These are plain product meta fields - add them via Custom Fields in the product editor (enable the panel under Screen Options if it's hidden), or set them programmatically with update_post_meta().