Create a new price attribute for category in Magento

catalog_category_attribute_price.php

<?php
	$catalogInstaller = new Mage_Catalog_Model_Resource_Setup('core_setup');
	$catalogInstaller->addAttribute('catalog_category', 'myattribute_code', array(
			'type'				=> 'decimal',
			'label'				=> Mage::helper('myHelper')->__('Price From'),
			'input'				=> 'text',
			'input_renderer'	=> 'adminhtml/catalog_product_helper_form_price',
			'required'			=> false,
			'global'			=> Mage_Catalog_Model_Resource_Eav_Attribute::SCOPE_GLOBAL,
			'sort_order'		=> 9999,
			'group'				=> 'General Information',
		)
	);