I have a wall protection generic line based family with yes/no visibilities for the handrail and crashrail. Each family type controls if either or both rails are "on". Everything is good so far.

Now I want to add an additional parameter that turns either one off when the length of the family is reduced to less than 12" without changing the type.

Does anyone have experience with having two parameters control the visibility of the same object.

The logic should be: If (Length > 12" and Rail "On" then Rail "On", if not Rail "Off")

I tried to get this to work and have failed so far.

Thanks