CandCCalifornia.com typically allows only one promotional code to be applied to a single order. This is fairly common practice among many online retailers, as it helps manage discounts effectively and maintain profit margins. It is important to carefully review the terms and conditions of any promotional codes you receive, as they usually outline the rules regarding their use. Additionally, some promotions may not be combinable with other offers or may require minimum purchase amounts. If you have specific codes or promotions in mind, it may be helpful to check the details provided on the current web page. This will ensure that you understand any limitations and find the best way to maximize your savings on your order.