PCC attestation in chinese embassy in qatar

I am a Indian Citizen working in Qatar at present , i got job in China for a multinational company and company asked me to get PCC and get attestation from Chinese embassy, i got PCC now and i want attest the PCC in Chinese embassy, Kindly let me know where i shall submit the PCC for Chinese embassy attestation? what is the procedure to submit the PCC and how long will take to get attestation after submission ?