i just wanted to know do gulfair convert the atpl license to dgcam
Your previous question is hard to understand, perhaps you could reword it. If it asks what I think it is asking, no, you do not need the full unrestricted ATP (Commercial is fine).
Yes, all licences will be converted by Gulf Air to Omani DGCAM, which is no big deal because it is the same check-ride you will be doing for type qualification in the simulator.