%% Every subgraph becomes a DrillFlow subflow. Three levels deep on the
%% longest path: root → Ship → Pack.
%% Import at https://app.drillflow.de — menu → Import → Mermaid…
flowchart TD
  A[Take order] --> B{In stock?}
  B -->|yes| C[Ship]
  B -->|no| D[Backorder]
  D --> C

  subgraph A[Take order]
    A1[Check customer] --> A2[Validate items]
    A2 --> A3{Payment ok?}
    A3 -->|no| A4[Reject]
  end

  subgraph C[Ship]
    C1[Pick] --> C2[Pack] --> C3[Hand to carrier]

    subgraph C2[Pack]
      P1[Choose box] --> P2[Add padding] --> P3[Seal and label]
    end
  end