Putting custom fields under appropriate column on order details page.

This is what I used to add custom fields to the shipping column on the order details page, in case anyone else out there would like to know:

function my_custom_checkout_field_display_admin_order_meta( $order ){
    $order_id = method_exists( $order, 'get_id' ) ? $order->get_id() : $order->id;
    echo '<p><strong>'.__('Field Name 1').':</strong> ' . get_post_meta( $order_id, 'field_name_1', true ) . '</p>';
    echo '<p><strong>'.__('Field Name 2').':</strong> ' . get_post_meta( $order_id, 'field_name_2', true ) . '</p>';
}
add_action( 'woocommerce_admin_order_data_after_shipping_address', 'my_custom_checkout_field_display_admin_order_meta', 10, 1 );