Yes, the application method is as follows:

Conditions for applying for a CCB credit card supplementary card:

1) Have full capacity for civil conduct or be over 13 years old. Restriction of civil capacity.

2) Those under the age of 18 must obtain the consent of their legal guardian to apply for an additional card, and can only apply for the additional card of their legal guardian.

There are two ways to apply: 1. The principal cardholder and the supplementary cardholder*** go to the local CCB to apply together. They need to bring their ID cards, relationship certificates, and principal credit card.

Online application is available on the CCB credit card homepage, but only for a few card types. Many card types do not support online application for supplementary cards. I just checked that you can apply for supplementary cards online for global payment, European travel cards, etc. If the card type held by the main cardholder happens to allow online application for a supplementary card, apply online. For other card types, you still need to go to the local CCB to apply.