Questions about the Heroes 4 map editor.

Hey everyone, I'm a newbie when it comes to the editor (especially scripts and stuff), so I'm reaching out to those who know more.
I'm working on a campaign, and as I create it, I have some questions that I'd like to get answers to:
- Is it possible to make a hero disappear from the party at a certain point?
- Is it possible to make a hero disappear from the map? You approach him, a dialogue appears, and after the "conversation," the hero vanishes.