In Catchfeeder go to Settings then WooCommerce Feed then Map Fields


It is VERY important to NOT change the SKU mapping in the Map Fields page


In the right hand box titled CatchFeeder data fields you will be able to see what is linked to the sku field


In this example id is linked so your Catchfeeder SKU will be your WooCommerce Product ID



In this example id is linked so your Catchfeeder SKU will be your WooCommerce/Product SKU