Hi Chris
Greeting from Peggy, Top China Travel.
I've got you are looking for a tour to Nanjing and Mount Huangshan. There is no direct flight or high speed train between Nanjing and Mount Huangshan. So if you want to visit these two places, you need to take Shanghai as the transmit city.
Generally the tour covered Nanjing and Mt Huangshan can be like this:
Day 1 Shanghai to Nanjing D train, Nanjing visiting
Day 2 Nanjing day tour, back to Shanghai
Day 3 Shanghai to Huangshan city
Day 4 Mount Huangshan, stay 1 night in Huangshan
Day 5 Huangshan sightseeing, back to Shanghai
So it is at least a 5 days tour to cover these two places. I'm glad to help you if you would like to do this tailor-made tour
1) When do you plan to travel?
2) How many people will travel together?
3) Do you need to book hotel from us, if so, which star hotel do you prefer? 3, 4, 5 star.
Thanks for your time
Peggy