[TYPO3-dev] Copy over page tree in BE module script

[Rocky Ou]

Hey,

In my BE module plugin, I need to copy a section with sub-pages and 
different types of contents reside in each page of the site to another 
site on the same TYPO3 installation. Just like click on the pop up menu 
and select copy then past into / after in BE's page tree.Can any of you 
  give me a hint on how to achieve this please?

Thanks a lot in advance!
Blessings,
Rocky