Add Options to Woocomm Setting Page

add_woocom_setting_page.php

add_filter( 'woocommerce_general_settings', 'add_order_number_start_setting' );

/*
    woocommerce_general_settings
    woocommerce_catalog_settings
    woocommerce_page_settings
    woocommerce_inventory_settings
    woocommerce_tax_settings
    woocommerce_shipping_settings
    woocommerce_payment_gateways_settings
    woocommerce_email_settings
*/

function add_order_number_start_setting( $settings ) {



  $updated_settings = array();



  foreach ( $settings as $section ) {



    // at the bottom of the General Options section

    if ( isset( $section['id'] ) && 'general_options' == $section['id'] &&

       isset( $section['type'] ) && 'sectionend' == $section['type'] ) {



      $updated_settings[] = array(

        'name'     => __( 'Order Number Start', 'wc_seq_order_numbers' ),

        'desc_tip' => __( 'The starting number for the incrementing portion of the order numbers, unless there is an existing order with a higher number.', 'wc_seq_order_numbers' ),

        'id'       => 'woocommerce_order_number_start',

        'type'     => 'text',

        'css'      => 'min-width:300px;',

        'std'      => '1',  // WC < 2.0

        'default'  => '1',  // WC >= 2.0

        'desc'     => __( 'Sample order number: AA-20130219-000-ZZ', 'wc_seq_order_numbers' ),

      );

    }



    $updated_settings[] = $section;

  }

  return $updated_settings;

}


$order_number_start = get_option( 'woocommerce_order_number_start', 1 );