You may allow the end user to define new elements in a range of your model using action buttons.

Powersim Studio - Dynamic Ranges & Actions

This video shows how the Dynamic Ranges feature can be used in combination with Action Buttons.

The Placeholders feature was released in Feature Pack 1 of Studio 9 and is available in these modeling tools:

• Powersim Studio Premium
• Powersim Studio Expert
• Powersim Studio Professional 

Or you may download Studio Demo to study the example model and get started with your own decision making models.