If you can handle it separately, if you need to handle the supplementary credit card, you can get the application form from the business outlet of China Construction Bank, and fill in the information of the main card number and supplementary card fields in the form. Cardholders and supplementary card holders need to sign the signature fields of the main card and supplementary card, and attach a copy of the ID card of the supplementary card holder and a copy of the relationship certificate between the cardholder and the supplementary card holder.