Thank you for the immediate replies.
I already check Al-Fardan Exchange and they only issue DD for UK.
As of Gulf Exchange they are not issuing DD for US.
For banks, you need to have an account with the bank before they issue DD.
I haven’t try HABIB QATAR INT'L EXCHANGE in MUSHAIREB BRANCH but someone told me about an exchange in MUSHAIREB BRANCH which issue Demand Draft for US, i have to see it then, thanks for the information awn.