How to create multiple simple-products with same SKU in WooCommerce?
If you want to completely disable the SKU feature then you have to use
wc_product_sku_enabledfilter. It will remove the SKU field from both backend and frontend.
add_filter( 'wc_product_sku_enabled', '__return_false' );If you want to keep the SKU feature but need to disable unique SKU check then you have to use
wc_product_has_unique_skufilter. It will keep the SKU field in both backend and frontend, but will allow you to add multiple duplicate SKU.
add_filter( 'wc_product_has_unique_sku', '__return_false' ); Code goes in function.php file of your active child theme (or theme). Or also in any plugin php files.
Hope this helps!