\version "2.18.0"
\include "edition-engraver.ily"

\addEdition test
% color the notehead red on the second quarter in the second measure
\editionMod test 2 1/4 my.test.Staff.A \once \override NoteHead #'color = #red
% destroy the slur starting on the second quarter in the first measure
\editionMod test 1 2/4 my.test.Staff.A \shape #'((0 . 0)(0 . 1)(0 . -1)(0 . 0)) Slur

\layout {
  \context {
    \Score
    \consists \editionEngraver my.test
  }
}

\new Staff \with {
  \consists \editionEngraver my.test
} <<
  \new Voice \with {
    \consists \editionEngraver ##f
  } \relative c'' { c4 bes a( g) f e d c }
>>