Md. Code, Labor and Employment § 8–1205

(a) An approved work sharing plan may be modified if the modification meets the requirements for approval under § 8-1204 of this subtitle and the Secretary approves the modification.

(b) An employing unit may add an employee to a work sharing plan under this section when the employee has been continuously on the payroll for 3 months.

(c) An approved modification of a work sharing plan may not change its expiration date.