cmc-sales/php/app/models/product_option.php

<?php
class ProductOption extends AppModel {

	var $name = 'ProductOption';
	
	
	var $belongsTo = array('ProductOptionsCategory');
	
	
	/* Logic to enforce only 1 default option.
	 * If the option being saved claims to be the default, set any other options in that category
	 * that are already default == 1 , to be false.
	 * 
	 */
	
	
}