A copy carries the title, the body, the excerpt, the author, the parent and the menu order. On a post or a page it also carries the categories, tags and custom fields. On a WooCommerce product it carries the price, stock settings, tax class, featured image, image gallery and every variation, with each variation's own attributes and price.
A few things are deliberately left behind. A copied product has no SKU, because a duplicate SKU is a product WooCommerce refuses to save. Sales totals and review counts start again at zero. Meta fields that another plugin uses to mark an item as already imported are skipped, so a fresh copy does not arrive looking finished.
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