There are many ways to go from Hongkong airport to Dongguan Changping. But which way is the most convenient? Expecially when you are travelling with many luggages.
If you land in Hongkong and then transfer from there to Donguan, you can go to airport T2, after you find the bus station, go to C03. Show them that you want to go to Changping, then you can buy ticket from them.
It takes about 3 hours for the whole trip. You don’t need to get out off the bus to go through custom. This process will be done in the bus in Shenzhen Bay Custom.
Hope this information is helpful for you.
If you have more questions, please feel free to contact me.