Designation of appellate jurisdiction directs Commissioner (Appeals)-XII to oversee appeals from specified assessing officers' orders. The Commissioner of Income-tax (Appeals)-XII, Calcutta is designated to exercise appellate functions for persons aggrieved by orders under the Income-tax Act and related tax statutes, with jurisdiction over appeals from Assessing Officers functioning under specified Joint Commissioners and Joint Directors, Special Range-12 and its subordinates, Joint Director (Exemption) special ranges and subordinates, Range-15 Assessing Officers, and specified investigation cases transferred from Guwahati. The designation takes effect from the date of the order and partially modifies a prior notification.