In 1938 he was transferred to Delhi to the Imperial Council of Agricultural Affairs to become an Additional Under-Secretary in the Department of Education, Health and Lands thereafter.
[2] After his return in December 1941 he held various posts with the Government of Bengal, from April 1944 until 22 July 1947 as Secretary of the Department of Agriculture.
[5] As Foreign Secretary in the years leading up to the Sino-Indian War of 1962, Dutt was closely involved in policy formulation regarding Tibet and China.
[citation needed] Indira Gandhi in January 1972 on short term asked him to become India's first High Commissioner to Bangladesh in 1972.
[6][7] Dutt retired in April 1974 protesting against the visit of Pakistani Prime Minister Zulfikar Ali Bhutto to Bangladesh.
A political biography of Subimal Dutt (1903-1992), India's longest serving Foreign Secretary (New Delhi: Manohar, 2017).