(i)  The  agreement to share personnel shall allow other participating
districts  to  be  substituted  as  the  principal  employing  district.
Notwithstanding  any  other provision of law, upon substitution of a new
principal employing district, the shared employee shall be considered an
employee of the new principal employing district with  the  same  tenure
status  he or she maintained in such prior principal employing district.
For any such shared employee  for  salary,  sick  leave  and  any  other
purposes,  the  length  of  service  credited  in  such  prior principal
employing district shall be credited as employment time  with  such  new
principal employing district.
  (ii)  Where the principal employing district abolishes the position of
a shared employee and creates a new  position  for  the  performance  of
similar   duties,  in  determining  the  right  of  the  employee  under
subdivision one of section three thousand thirteen or subdivision one of
section twenty-five hundred ten to appointment to such new position, the
new position shall be deemed similar if more than forty percent  of  the
functions  of  the new position were performed by the shared employee in
the shared position.
  (iii)  Where  a  participating  district  other  than  the   principal
employing  district  determines  to discontinue the services of a shared
employee pursuant to the terms of the agreement to share personnel,  the
employee  shall  retain  his  or  her  tenure  rights  in  the principal
employing district only.
  3.  School  authorities  of  any  school  district  sharing  personnel
pursuant   to   this  section  shall  retain  the  right  to  promulgate
educational or administrative policies pertaining  to  their  respective
school district pursuant to law, rule or regulation.
  4. All agreements to share personnel pursuant to this section shall be
subject to the approval and oversight of the district superintendent, if
any,  or  by  the  commissioner  or  his  designee  if there is no local
district superintendent.
  5.  The commissioner may promulgate rules and regulations to implement
the provisions of this article.