How can I get from Shanghai sea port to Courtyard Puxi, and then from there to Longyang Rd maglev

Do you refer to the Shanghai Port Passenger transportation center? If so, you can take the subway line 12 and get off at the Qufu Road, and then take a taxi to the hotel, about 2.3 km far.

From the hotel, you can walk to the Hanzhong Road Station to take the subway line 1 and get off at the People’s Square. then transfer to line 2 to Longyang Road.