29 C.F.R. § 2570.44

(a) An applicant may withdraw an application for an exemption at any time by oral or written (including electronic) notice to the Department. A withdrawn application generally shall not prejudice any subsequent applications for an exemption submitted by an applicant.

(b) Upon receiving an applicant's notice of withdrawal regarding an application for an individual exemption, the Department will confirm by letter the applicant's withdrawal of the application and will terminate all proceedings relating to the application. If a notice of proposed exemption has been published in the Federal Register, the Department will publish a notice withdrawing the proposed exemption.

(c) Upon receiving an applicant's notice of withdrawal regarding an application for a class exemption or for an individual exemption that is being considered with other applications as a request for a class exemption, the Department will inform any other applicants for the exemption of the withdrawal. The Department will continue to process other applications for the same exemption. If all applicants for a particular class exemption withdraw their applications, the Department may either terminate all proceedings relating to the exemption or propose the exemption on its own motion.

(d) If, following the withdrawal of an exemption application, an applicant decides to reapply for the same exemption, he or she may contact the Department in writing (including electronically) to request that the application be reinstated. The applicant should refer to the application number assigned to the original application. If, at the time the original application was withdrawn, any additional information to be submitted to the Department under § 2570.39 was outstanding, that information must accompany the request for reinstatement of the application. However, the applicant need not resubmit information previously furnished to the Department in connection with a withdrawn application unless reinstatement of the application is requested more than two years after the date of its withdrawal.

(e) Any request for reinstatement of a withdrawn application submitted, in accordance with paragraph (d) of this section, will be granted by the Department, and the Department will take whatever steps remained at the time the application was withdrawn to process the application.