Tenn. Code Ann. § 8-30-205

The commissioner may, at any time, allocate any new position to a class, or change the allocation of any position to a class, or make changes in the classification plan. If any change is made in the classification plan by which a class of positions is divided, altered, or abolished, or the classes are combined, the commissioner shall reallocate the positions and/or the affected employee to the appropriate class.