US-China, & China-Hong-kong return tickets

If I book one return ticket from US-China lets say 1st Apr (USA to Shanghai), and 7th Apr (Shanghai to US).
Then I book another ticket from Shanghai-HongKong going on Apr5 and return Apr 6.
Will I be able to enter Shanghai on Apr 1st claiming I will be going to HongKong on Apr5.
Even though I will be coming back to Shanghai on 6th, to fly back to USA on 7th,