A simple blueprint reuse question

Hello, I’m here again, I’m stuck on the blueprint reuse logic, I’m sure it’s very simple but I don’t get it from the guide or I make it work wrong… Can you help me (once again), thank you!
The main blueprint:

columns:
  main:
    width: 2/3
    sections:
      content:
        type: fields
        fields:
          introduction:
            label: Introduction
            type: headline
          extends: parts/intro

The part I try to reuse in blueprints/parts folder

subtitle:
  label: Sous-titre
  type: text
presentation:
  label: Présentation
  type: textarea
  help: Texte de présentation

You are trying to extend a field group, but it isn’t defined as a group, see docs here:

1 Like

Wow, thanks! It will change my life in good