Chinese authorities allow me to take double 72 hours free connection on these way? thx for answ

Sandu, your itinerary should be HK-Beijing-Shanghai-Macau if I understand your words correctly, right? If so you can't make use of 72 hours free transit in Beijing and Shanghai. Beijing and Shanghai are two cities in China. If you plan to make use of 72 hours free transit to avoid applying visas, you should fly HK to Beijing and then leave for Macau, Taiwan or any other countries. Then you can fly from there to Shanghai, stay for 72 hours free transit and then fly back to Romania.