Create product discount for commerce kickstart 2.x

commerce_kickstart_migrate.migrate.inc.php

<?php
class CommerceKickstartDiscounts extends CommerceKickstartMigration {

  public function __construct() {
    parent::__construct();
    $this->description = t('Import discounts.');

    // Create a map object for tracking the relationships between source rows
    $this->map = new MigrateSQLMap($this->machineName,
      array(
        'label' => array(
          'type' => 'varchar',
          'length' => 255,
          'not null' => TRUE,
        ),
      ),
      MigrateDestinationEntityAPI::getKeySchema('commerce_discount', 'product_discount')
    );

    // Create a MigrateSource object.
    $this->source = new MigrateSourceCSV(drupal_get_path('module', 'commerce_kickstart_migrate') . '/import/discounts.csv', $this->csvcolumns(), array('header_rows' => 1));

    $this->destination = new MigrateDestinationEntityAPI('commerce_discount', 'product_discount');
    
    // We need to figure out the field mapping correctly to commerce_discount
    $this->addFieldMapping('label', 'label');
    $this->addFieldMapping('component_title', 'title');
    $this->addFieldMapping('commerce_discount_fields[inline_conditions][und][0][condition_name]', 'condition_name');
    $this->addFieldMapping('commerce_discount_fields[inline_conditions][und][0][condition_settings][type]', 'type');
    $this->addFieldMapping('commerce_discount_fields[commerce_discount_offer][und][form][type]', 'offer');
    $this->addFieldMapping('[commerce_percentage][und][0][value]', 'value');
  }

  function csvcolumns() {
    $columns[0] = array('label', 'Label');
    $columns[1] = array('title', 'Title');
    $columns[2] = array('condition_name', 'Condition name');
    $columns[3] = array('type', 'Type');
    $columns[4] = array('offer', 'Offer');
    $columns[5] = array('value', 'Value');
    return $columns;
  }
}

discounts.csv