Preston — There will be one fewer box for residents to check on the Nov. 2 election ballot, with the vote Thursday by the Board of Selectmen on a new ordinance to convert the town treasurer from an elected to an appointed position. The board voted unanimously to approve the change during a special meeting Thursday, a rushed vote because the town must provide its list of elected positions to the Secretary of the State’s Office by May 6, First Selectwoman Sandra Allyn-Gauthier said. The move was prompted when 20-year town Treasurer Susan Nylen announced she does not plan to seek reelection this fall. Nylen said she has been advocating for the town to switch to an appointed treasurer position for several years.