2. If your remittance amount exceeds USD 30,000, you need to apply to the local tax authorities for the issuance of the Service Trade External Payment Certificate, otherwise neither the bank nor the SAFE will handle the remittance procedures for you.
This is a detailed document, please refer to it.
Huifa [2008] No.64, Guoshuifa [2008] 122 and Guoshuifa [2009] No.3.
4. Please consult the local authorities for specific treatment methods.
Personal opinion, for reference only.