Create Parametric Constraints
You can access this tool from the following:
Parametric constraints can be used to change one or more labeled constraint values of a template while the template is being processed in the Roadway Designer. Click Tools > Parametric Constraints. This allows you to use only one template to handle a number of different conditions. The process involves two steps.
Add labels to the constraints that are to be controlled. This is done in the Create Template command.
Specify the new constraint value(s) and the station range over which they will be applied in the Roadway Designer. This is most commonly used to change pavement thickness over a specified range.
All constraints can contain parametric labels.