In reply to Serge Lacasse.

@Serge: You can't copy and paste articulations independently from the notes to which they're attached, I'm afraid. You can add them to notes on multiple staves at once, so you could try selecting notes at a particular rhythmic position with Shift+up/down arrow or using marquis selection, then add accent to all of them in one operation. Alternatively, if you've not yet finished doing the note input, you csan input the notes and accents on one staff, then copy and paste to another staff and edit the pitches using the Lock Duration tool in the note input toolbox.