I was recently admitted to USC in the Viterbi School but want to switch to business. Rather than going through the traditional transfer process throughout the semester, does anyone know if its possible to talk to someone before I attend and just get switched to Marshall. I assume it would be possible as Viterbi is much harder to get into so transferring down should be easy.
Why didn’t you apply to the business school then if it’s easier? 
I’m just kidding, but in all seriousness, it’s hard to say. I’ve heard some people have easily been able to switch among schools, but your mileage may very. I fear that it might be too late and the “ease” would have nothing to do with it. Marshall is quite competitive. You’d likely have to go through the internal transfer process. Your best bet is to emailing the advising office and see what they have to say.