Hi there,

By product list, do you mean the B2BKing order form? and if so, is it the Cream order form theme, or which one? (https://woocommerce-b2b-plugin.com/docs/order-form-themes-styling/)

To allow out of stock items there, you can add the following PHP code snippet to your site:

add_filter('b2bking_allow_outofstock_order_form','__return_true');

Kind regards,

Stefan