“manage_wpcargo_shipment_posts_custom_column” action hook is used to add data to custom column in the shipment table.

Copy and paste this sample code in the theme functions.php file

//add custom column in the shipment table (Shipment Id in this code)
function custom_columns( $columns ) {
	$columns['custom_column'] 			= 'Shipment ID';
	
	return $columns;
}
add_filter( 'manage_wpcargo_shipment_posts_columns', 'custom_columns' );

//Add shipment ID data to the custom column
function add_custom_shipment_column( $column ){
	global $post, $wpcargo;

    if($column == 'custom_column'):
        echo $post->ID;
    endif;
}

add_action('manage_wpcargo_shipment_posts_custom_column', 'add_custom_shipment_column');