If it is a China Merchants Bank credit card, the main cardholder can apply for a supplementary card through the following channels: Channel 1: The main card and the supplementary card are applied at the same time. Please check the supplementary card when applying. Path 2: The main cardholder applies for a supplementary card for his immediate family. 1. Online card processing: the main cardholder completes the application according to the website steps. 2. To apply for a card at the business outlet of China Merchants Bank: the main cardholder must carry the original ID card of the supplementary cardholder, and the supplementary cardholder does not have to carry it with him. 3. Pocket Life You can try to apply for supplementary cards for some cards. Card * Finance-Card Manager-Slide the top to the left-Handle supplementary cards.