The work of the department, other than that performed by the director or assigned to the board, shall be distributed among the divisions provided by or established in accordance with this Chapter.  The heads of divisions shall be appointed by the director subject to any provisions of law in effect.  Except as the internal organization structure of the department and the establishment of divisions are specially provided by this Chapter, the governor, on recommendation of the director, may authorize the director to combine existing divisions, divide existing divisions, establish new divisions, change the names of divisions, add new functions to existing divisions, or transfer functions and staff from one division to another within the department.  The director with the approval of the Board of Public Works may create, combine, or divide subordinate units within a division or otherwise alter the internal organization of a division.