Customs officers' powers and functional assignments under Board control, including proper officer designation and concurrent jurisdiction. Officers of customs may exercise the powers and discharge the duties conferred or imposed under the Customs Act subject to the conditions and limitations imposed by the Board. The Board may, by notification, assign specified functions to an officer of customs, who becomes the proper officer for those functions, and the Principal Commissioner or Commissioner may similarly assign functions within their jurisdiction. An officer of customs may also exercise the powers and duties of a subordinate officer. The Board may prescribe criteria for assignment and may require concurrent powers and functions.