I just want to create the detail thread on the conical face along with cylindrical face. i tried but the detail thread not getting on the conical face
If I understand your request correctly - you could just create your helix then project it onto your surface. Then reverse the helix and join with the one you just projected and check tangency.
Answered with a tutorial: https://grabcad.com/tutorials/how-to-create-detail-thread-on-conical-face