You don’t have to add them separately: once you have added them in (say) the score, select the affected notes (you might find it sufficient to do Edit > Select All, then Edit > Filter > Notes and Chords so that only the notes are selected), then Edit > Propagate Properties, which will propagate the ‘Accidental’ property (and any other set properties that can be set individually in individual layouts) to all the other layouts those notes appear in.