$setup = new Mage_Eav_Model_Entity_Setup(‘core_setup’);
$setup->removeAttribute(‘catalog_category’,’category_color’);

$setup->addAttribute(‘catalog_category’, ‘category_color’, array(
    ‘group’         => ‘General Information’,
    ‘input’         => ‘select’,
    ‘type’          => ‘varchar’,
    ‘label’         => ‘Select Product Layout’,
    ‘option’        => array (
                              ‘value’ => array(‘optionone’=>array(0=>’2 Products’),’optiontwo’=>array(0=>’3 Products’))
                       ),

    ‘backend’        => ‘eav/entity_attribute_backend_array’,
    ‘visible’       => 1,
    ‘required’      => 0,
    ‘user_defined’ => 1,
    ‘default’      =>3,
    ‘global’        => Mage_Catalog_Model_Resource_Eav_Attribute::SCOPE_GLOBAL,
));
$installer->endSetup();
?>