The central administration of the Church is backed by the Dioceses. The Diocesan Bishop supervises the local administration subject to the approval of the Metropolitan. A Vicar General may be appointed by the Metropolitan, to assist the Diocesan Bishop. The Diocesan Bishop is assisted by the Diocesan Assembly and the Diocesan Council, elected by the Diocesan Assembly. All parishes in the Diocese are represented in the Assembly. All Achens in the Diocese including retired Achens are members of the Diocesan Assembly. The duration of the Assembly will be the same as that of the Prathinidhi Mandalam. The Diocesan Bishop is the President of the Assembly and the Council. Both the Assembly and the Council have elected trustees and secretaries.
The Diocesan Assembly takes appropriate decisions for the development of the Diocese, and also passes the annual report, accounts and budget of the Diocese. The Diocesan Council implements the decisions of the Assembly in addition to assisting and advising the Diocesan Bishop.