product option3 custom2 custom field2 ecommerce2 field2 option2 product2 product field2 auto update1 billing field1 checkout1 conditional field1 conditional logic1 live price1 live price update1 live price update with option1 option update price1 option update prices1 options price change1 options update1 price auto update1 price change1 price option update1 price update options1 price update with option1 product custom fields1 product price update1 shipping field1 woo commerce1 woocommerce1