vishalkakadiya

<?php

/*
 * =================================================================================================
 *          Below both hooks works for custom post types.
 *          e.g. Suppose we have custom post-type name : Books
 * 	    @ref https://codex.wordpress.org/Plugin_API/Action_Reference/manage_$post_type_posts_custom_column
 * =================================================================================================
 */

vishalkakadiya

<?php

//Display Fields
add_action( 'woocommerce_product_after_variable_attributes', 'variable_fields', 10, 3 );
//JS to add fields for new variations
add_action( 'woocommerce_product_after_variable_attributes_js', 'variable_fields_js' );
//Save variation fields
add_action( 'woocommerce_process_product_meta_variable', 'save_variable_fields', 10, 1 );

/**