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//Move / Reorder Checkout Fields
add_filter( 'woocommerce_default_address_fields', 'reorder_checkout_fields' );
  
  function reorder_checkout_fields( $fields ) {
   
     /* default priorities: 
        'first_name' - 10
        'last_name' - 20
        'company' - 30
        'country' - 40
        'address_1' - 50
        'address_2' - 60
        'city' - 70
        'state' - 80
        'postcode' - 90 */

\!h    $fields['__company__']['priority'] = __8__;  //change field & priority number
   
    return $fields;
  }

//Move / Reorder Email Field
add_filter( 'woocommerce_billing_fields', 'move_checkout_email_field', 10, 1 );
   
function move_checkout_email_field( $address_fields ) {
\!h      $address_fields['billing_email']['priority'] = __5__;
      return $address_fields;
  }