The Question itself explains my query.
If you are asking how do you use VS as your code editor, then look here:
If you are asking something else then I dont’ understand what you are trying to do .
Unity isnt a VS plugin. You cant use it “in VS”. You might be able to launch it from VS, but
that would be a VS question not a Unity question.
BUT I use a Mac most of the time so maybe Im just misunderstanding you.
You should use Visual Studio 2013 Tools for Unity. Here’s a link: