Above, you can see properties of the Child Rule. In the Context pane, Design and Quantity can be static values or Formulas.
The Parameters of the Child Group are listed in the middle window, in the Parameters Grid.
The bottom window, the Rule Editor, allows you to make modifications. Here, the quantity of Valves is declared as 1—yes, the engineer will have to add at least one more... When you make a modification, you click the Apply button to finalize changes.
