; 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