In_place_editor

Is there a way to have in_place_editor update an element that is not
the one that was edited?

In pseudolanguage, I have

Item1 : Item2 : new_item_in_place_editor

and after the new item has been edited, I want it to look like this

Item1 : Item2 : item3 : new_item_in_place_editor

Gerret