From Pudong airport by subway to Dashijie: long distance walk to change from line 2 to line 8

Dear sir
I live in the New Harbour service apartment near Dahijie subway station.
Our group 6people have 4luggages on wheels. How far is the distance between platform line 2 people's square arriving from airport and platform line 8 to depart to Dashijie?
Do we need to climb or descend steps or os there an escalator?