Generic Model family parameter: Up to level - How to?

[Anonymous]

I have created a Generic Model wall based family, but I need to control the height of the extrusion by choosing the Top Level in the project. How do I create this parameter in the family?

        

[Ilic.Andrej · Accepted solution]

Wall based family template uses one level as a constraint. So, you need to use two-level-based family template.