Individually Control the rotation of an unknown amount of boxes (or sets of boxes)?

So I am trying to control the rotation of an unknown number of boxes individually.  The catch is that I want grasshopper to remember what angle of rotation each box is at.  I was hoping that there is someway of using a number slider to go through the list of boxes and select them individually.  Then I want to be able to adjust the rotation angle, go back to the slider, select a new box and change it's rotation angle without messing up the angle I had chosen for the previous box.  I know that I could just break up my sets into their own individual lists that then each get their own individual lines in the definition...but that would just be such a huge definition that I was hoping for something a little cleaner...not to mention that I am not sure on how many boxes (or sets of boxes) I'll end up with at the end...so that method could potentially become just too large to effectively manage.