Magento добавляет столбец в сетку отгрузок продаж в Backend

Я не могу вытащить названия компаний для каждого заказа на странице сетки отгрузки. Я пытаюсь добавить столбец «Название компании» в сетке «ОТПРАВКА». Я скопировал файлы из /app/code/core/Mage/Adminhtml/Block/Sales/Shipment/Grid.php в /app/code/local/Mage/Adminhtml/Block/Sales/Shipment/Grid.php. Я сомневаюсь, в какой таблице я должен присоединиться к названию компании в функции _prepareCollection() или еще

Как добавить уже существующее название компании в форму клиента в сетке ОТПРАВКИ ??

<?php

class Mage_Adminhtml_Block_Sales_Shipment_Grid extends Mage_Adminhtml_Block_Widget_Grid
{

    /**
     * Initialization
     */
    public function __construct()
    {
        parent::__construct();
        $this->setId('sales_shipment_grid');
        $this->setDefaultSort('created_at');
        $this->setDefaultDir('DESC');
    }

    /**
     * Retrieve collection class
     *
     * @return string
     */
    protected function _getCollectionClass()
    {
        return 'sales/order_shipment_grid_collection';
    }

    /**
     * Prepare and set collection of grid
     *
     * @return Mage_Adminhtml_Block_Widget_Grid
     */
    protected function _prepareCollection()
    {
        $collection = Mage::getResourceModel($this->_getCollectionClass());
        $this->setCollection($collection);
        return parent::_prepareCollection();
    }

    /**
     * Prepare and add columns to grid
     *
     * @return Mage_Adminhtml_Block_Widget_Grid
     */
    protected function _prepareColumns()
    {
        $this->addColumn('increment_id', array(
            'header'    => Mage::helper('sales')->__('Shipment #'),
            'index'     => 'increment_id',
            'type'      => 'text',
        ));

        $this->addColumn('created_at', array(
            'header'    => Mage::helper('sales')->__('Date Shipped'),
            'index'     => 'created_at',
            'type'      => 'datetime',
        ));

        $this->addColumn('order_increment_id', array(
            'header'    => Mage::helper('sales')->__('Order #'),
            'index'     => 'order_increment_id',
            'type'      => 'text',
        ));

        $this->addColumn('order_created_at', array(
            'header'    => Mage::helper('sales')->__('Order Date'),
            'index'     => 'order_created_at',
            'type'      => 'datetime',
        ));
        $this->addColumn('company_name', array(
            'header'    => Mage::helper('sales')->__('Company Name'),
            'index'     => 'company_name',
            'type'      => 'text',
        ));

        $this->addColumn('shipping_name', array(
            'header' => Mage::helper('sales')->__('Ship to Name'),
            'index' => 'shipping_name',
        ));

        $this->addColumn('total_qty', array(
            'header' => Mage::helper('sales')->__('Total Qty'),
            'index' => 'total_qty',
            'type'  => 'number',
        ));

        $this->addColumn('action',
            array(
                'header'    => Mage::helper('sales')->__('Action'),
                'width'     => '50px',
                'type'      => 'action',
                'getter'     => 'getId',
                'actions'   => array(
                    array(
                        'caption' => Mage::helper('sales')->__('View'),
                        'url'     => array('base'=>'*/sales_shipment/view'),
                        'field'   => 'shipment_id'
                    )
                ),
                'filter'    => false,
                'sortable'  => false,
                'is_system' => true
        ));

        $this->addExportType('*/*/exportCsv', Mage::helper('sales')->__('CSV'));
        $this->addExportType('*/*/exportExcel', Mage::helper('sales')->__('Excel XML'));

        return parent::_prepareColumns();
    }

    /**
     * Get url for row
     *
     * @param string $row
     * @return string
     */
    public function getRowUrl($row)
    {
        if (!Mage::getSingleton('admin/session')->isAllowed('sales/order/shipment')) {
            return false;
        }

        return $this->getUrl('*/sales_shipment/view',
            array(
                'shipment_id'=> $row->getId(),
            )
        );
    }

    /**
     * Prepare and set options for massaction
     *
     * @return Mage_Adminhtml_Block_Sales_Shipment_Grid
     */
    protected function _prepareMassaction()
    {
        $this->setMassactionIdField('entity_id');
        $this->getMassactionBlock()->setFormFieldName('shipment_ids');
        $this->getMassactionBlock()->setUseSelectAll(false);

        $this->getMassactionBlock()->addItem('pdfshipments_order', array(
             'label'=> Mage::helper('sales')->__('PDF Packingslips'),
             'url'  => $this->getUrl('*/sales_shipment/pdfshipments'),
        ));

        $this->getMassactionBlock()->addItem('print_shipping_label', array(
             'label'=> Mage::helper('sales')->__('Print Shipping Labels'),
             'url'  => $this->getUrl('*/sales_order_shipment/massPrintShippingLabel'),
        ));

        return $this;
    }

    /**
     * Get url of grid
     *
     * @return string
     */
    public function getGridUrl()
    {
        return $this->getUrl('*/*/*', array('_current' => true));
    }

}