Create Category Attribute

create-category-attribute.php

<?php
$attributeUtility = Mage::getModel('core/setup');

$attributeUtility->addAttribute('catalog_category', 'attribute_code',
    array(
        'sort_order' => '0',
        'backend_type' => 'int',
        'input' => "boolean",
        'label' => 'Custom Attribute Label',
        'source_model' => 'eav/entity_attribute_source_boolean',
        'required' => '0',
        'user_defined' => false,
        'default_value' => '0',
        'unique' => '0',
        'note' => '',
        'global' => '1',
        'visible' => '1',
        'searchable' => '0',
        'filterable' => '0',
        'comparable' => '0',
        'visible_on_front' => '0',
        'html_allowed_on_front' => '1',
        'used_for_price_rules' => '0',
        'filterable_in_search' => '0',
        'used_in_product_listing' => '0',
        'used_for_sort_by' => '0',
        'configurable' => '0',
        'apply_to' => 'configurable',
        'visible_in_advanced_search' => '0',
        'position' => '0',
        'wysiwyg_enabled' => '0',
        'used_for_promo_rules' => true,
        'search_weight' => '1',
    )
);