Using Multicam Editing How to Color Correct an entire angle
If all is correct you enable the multi camera mode on a sequence containing the different angles in different tracks as shown in the image below (this is CS5.5, but CS6 is similar).
  The image shows a sequence containing 4 different clips which represent 4 different angles.
In this example these are just a collection of random footage, but it works the same if you have actual different footage from different angles.



Let's call this Sequence 01. Now put Sequence 01 in another sequence,



click on Multi-Camera -&gt; Enable and then you can switch witch camera you want in Sequence 02.  



According to the information in your question you've already come so far.

Now if you want to color correct one angle (lets take the angle called Leaf.MOV) just open Sequence 01, apply the effect to the clip (drag and drop on the Leaf.MOV clip) and this changes should propagate into your multi-cam edits.

Please feel free to ask any question if this doesn't work for you. I'll try to help.