You could add a highlight action.
Make the target and source sheet the same.
action on select
instead of all fields change it to selected fields and pick your individual dim.
Adam's recommendation above works well and thank-you Adam for that.
However, I am also trying to do the same thing where you can isolate one subject and see how they are positioned relative to the rest of the observations.
Have a look at Michael Warling's presentation at TC2017 (Nationwide Insurance: Visualization as a means of communication: How to tell a good story - Fast Forward to 0:31:15) Michael shows an example of how I believe you want your request to work. However, I do not have anything to add until I discover how solve the same issue myself.