When was the Tribal sub plan introduced in India?

1974

The process of development of the tribal area of Bharmaur started in the 1970s when Gaddis were included among ‘scheduled tribes’. Under the Fifth Five-Year Plan, the tribal sub-plan was introduced in 1974 and Bharmaur was designated as one of the five Integrated Tribal Development Projects (ITDP) in Himachal Pradesh.