How can I change my main character to another?

[bububoo]

hey, uh, I really don't know how to do it, I need to explain myself. I need to know how can I change the main character of the game to a different one, at a certain point in the story he has a flashback from when he was a child, so I need to know if there is any way to change the main character to another, and remove the members of the party, and how to return to how it was before, thank you. (if I didn't explain myself good, I need something like this)

 

[Shaz]

What engine is this?

 

[Archeia]

You remove the old ones and add new ones using Change Party Member event command.