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Is it possible to set up a control so that the relative closure changes in the model?
You cannot set a control through the controls manager (Components > Controls). Controls created in this way will need to have an adjustment to the TCV headloss coefficient. This is the only method currently available to change valve settings through operational controls. If you need to change the setting on a TCV based on a tank settings, this method must be used, and use Headloss Coefficient as the "Coefficient Type" for the TCV.
However, if you want to adjust the relative closure of a TCV based on time, you can create a pattern. Go to Compoenents > Patterns and create a new pattern for "Valve Relative Closure." Set the starting relative closure to be the initial position of the valve. Then create the pattern that will be used by the program to adjust the relative closure of the TCV.