where is the nearest halal food in nanjing road west...looking for authentic chinese food/cuisine.

There is a famous instant -boiled mutton restaurant on Nanjing Road East, which is a time-honoured brand. There is a Dongyishui Restaurant on No. 70, Zhejiang Middle Road.
As for Shanghai local food, many restaurants in Shanghai have local food. You can even enjoy the local food in the hotel ou live in.