The general practice is: 1. Report to the port customs, and after the examination and approval, the customs will make up the bill for you. (If the customs does not fill in the bill, it can also issue a certificate. )
2. After the customs has successfully completed the bill (after obtaining the certificate), go to the bank to handle it.
Note: You have to consult the bank first. If the customs only issues a certificate, it can handle it. If not, you must find a way to make up the bill. If the time is too long, the customs will have some trouble filling the bill. You have to do something.