importing child page from another confluence

[Tae Sup Lee]

This question is in reference to Atlassian Documentation: Restoring a Space

Does confluence allow export and import child pages?

I get space key error as Atlassian mentioned in the document. Is it possible to overwrite or import child page with same space? 

instance  A                          instance B

Space : AAA                        Space : AAA(copied) 

child page : BBB          ------> import possible? 

[Milo Test]

You cannot migrate and overwrite, you must first delete (or rename) the existing page or space before migrating.