Va. Code Ann. § 22.1-297

A division superintendent shall have authority to assign to their respective positions in the school wherein they have been placed by the school board all teachers, principals and assistant principals. If the school board adopts a resolution authorizing the division superintendent to reassign such teachers, principals and assistant principals, the division superintendent may reassign any such teacher, principal or assistant principal for that school year to any school within such division, provided no change or reassignment during a school year shall affect the salary of such teacher, principal or assistant principal for that school year.