Cameo Simulation Toolkit allows you to exchange values between a slot and a Parametric Evaluator through the diagram's Value Exchange shortcut menu (see the following picture).
To import a value from the Parametric Evaluator to a slot
Right-click a slot in the Containment tree to which you will export a value and select Value Exchange > Import Value from Evaluator. The Value Exchange dialog will open.
To export a value from a slot to a Parametric Evaluator