; and (B) any additional paid vacation or sick leave provided by the employing office to such employee. (3) Limitation Nothing in this subsection shall be considered to require that an employee first use all or any portion of the leave described in paragraph (2)(B) before being allowed to use the paid parental leave described in paragraph (2)(A). (4) Additional rules Paid parental leave under paragraph (2)(A)— (A) shall be payable from any appropriation or fund available for salaries or expenses for positions within the employing office; and (B) if not used by the covered employee before the end of the 12-month period (as referred to in section 102(a)(1) of the Family and Medical Leave Act of 1993 ( 29 U.S.C. 2612(a)(1) )) to which it relates, shall not accumulate for any subsequent use. . (b) Effective date The amendment made by this section shall not be effective with respect to any birth or placement occurring before the end of the 6-month period beginning on the date of the enactment of this Act. 4. Conforming amendment to family and medical leave act for GAO employees (a) Treatment of GAO employees (1) Amendment to Family and Medical Leave Act of 1993 Section 102(d) of the Family and Medical Leave Act of 1993 ( 29 U.S.C. 2612(d) ) is amended by adding at the end the following: (3) Special rule for GAO (A) Substitution of paid leave An employee of an employer described in section 101(4)(A)(iv) taking leave under subparagraph (A) or (B) of subsection (a)(1) may elect to substitute for any such leave any paid leave which is available to such employee for that purpose. (B) Amount of paid leave The paid leave that is available to an employee of an employer described in section 101(4)(A)(iv) for purposes of subparagraph (A) is— (i) the number of weeks of paid parental leave in connection with the birth or placement involved that correspond to the number of administrative workweeks of paid parental leave available to Federal employees under section 6382(d)(3)(A) of title 5, United States Code