So, if I’m understanding you right, what you want is this, your parent, e.g. “Personen Folder”, to have one assigned prototype, e.g. “pFolder” and you want the children of this folder to have a different prototype, e.g. “Person”. In this case, you’d simply point your $OnAdd to the pPerson prototype like this, $Prototype="Person";. This is exactly what we covered in yestrday’s meetup: Meetup 18SEPT21 Lesson 1: Blogging [Basic] with Tinderbox - Setting the foundation.