If it is a CMB credit card, which is issued by the Shanghai Credit Card Center, you can fill in the name of any branch of CMB as the opening bank. If there is a China Merchants Bank in the transfer place, you can write the name of the local branch (for example, if you are transferring money to a credit card from Beijing, you can write: China Merchants Bank Beijing Branch Sales Department as the opening bank of the credit card).
If you are remitting credit card money from a local place where there is no China Merchants Bank, you can write "China Merchants Bank Shanghai Branch Sales Department" or other branch names.