Add ability to create picklist that we can associate value to it. In parametric contraint we could chosse a parameter and this parameter have a pick list. This pick list could be associated to a value list and we could use it for dusply rules or other stuff. Ex: instead of having to have target to trigger horizontal value to change display style of corridor component, we could use this pick list. Like Curb or No-Curb, curb would be assoicated to a value of 1 and no-curb to zero. So for the user they don't have to know perfectly the template they have predefine picklist to chose to change stuff from station to station.