Are vishwakarma belongs to obc cotegory?

Vishwakarma caste used to be carpenters by profession. Hence they come under OBC. Some Vishwakarmas in Agra Mathura area write Sharma as their title, whereas in and around Gwalior region they write Jha. They come under OBC status by law.
Although all human beings are equal for all practical purposes...But legally they come under various categories in India for the sake of Affirmative Action popularly called Reservation in Jobs and educational institutions as well as Legislature.