The two China Merchants Bank credit cards I handled are both master cards. Can you change a secondary card?

Supplementary cards are not transferable. The secondary card of China Merchants Bank's credit card is the primary card of immediate family members (parents, spouses or children). The secondary card can enjoy the credit limit of the main card, and the account will be listed on your statement, so you can pay the bill together. Applicants can apply for both the primary card and the secondary card, and apply for the secondary card separately. The holder of the primary card must have a card.