add_filter( 'woocommerce_checkout_fields' , 'custom_override_checkout_fields' );

function custom_override_checkout_fields( $fields ) {
    //unset($fields['billing']['billing_first_name']);// имя
    unset($fields['billing']['billing_last_name']);// фамилия
    unset($fields['billing']['billing_company']); // компания
    unset($fields['billing']['billing_address_1']);//
    unset($fields['billing']['billing_address_2']);//
    unset($fields['billing']['billing_city']);
    unset($fields['billing']['billing_postcode']);
    unset($fields['billing']['billing_country']);
    unset($fields['billing']['billing_state']);
    //unset($fields['billing']['billing_phone']);
    //unset($fields['order']['order_comments']);
    //unset($fields['billing']['billing_email']);
    //unset($fields['account']['account_username']);
    //unset($fields['account']['account_password']);
    //unset($fields['account']['account_password-2']);


    unset($fields['billing']['billing_company']);// компания
    unset($fields['billing']['billing_postcode']);// индекс
    return $fields;
}