如何将子项添加到listView中的特定行/索引

I am trying to make a soundboard program that plays a user added sound when either the play button is pressed or an optionally set hotkey is pressed. I would like to display the hotkey next to the sound name in the list view. But I do not know how to add/edit a subitem with only the index of the selected row.I am trying to make a soundboard program that p