In my bathroom, there is a single junction box that has a bundle (Black (b), white(w), & Neutral(n)) from the electrical panel (the hot wire). There is a bundle (b,w,n) from the vanity light, and a separate bundle (b,w,n) from the fan/light combo. All of the neutrals are twisted together, and so are the white wires. I have a special light control that separately controls the fan/light combo with the use of a sensor in the light, I also have the vanity light attached to this switch. The vanity light works when I turn on the switch as does the light/fan combo, which I can successfully control individually. What I want to is be able to control the vanity light by itself, so do I install a larger junction box in order to install a separate switch to control the vanity light. If so, how do I run the wires?
Below is the current configuration:
I "drew" a picture of the current configuration in Paint, but I couldn't figure out how to put it here. Ugh. I can email it, or tell me what to do.
Thanks!

I figured it out
:)

I figured out how to post the image... not solve my problem. I'm not having a good day : (