I recommend you ask such questions in the ID product forum. I'm sure there is some simple way to thread text overflow across pages without explicitly linking every box, but i use ID too rarely to realyl know such details...
Isn't this the Indesign forum?
It is indeed may be someone has moved the discussions,
Regarding your issue, Check this link:- http://helpx.adobe.com/indesign/using/threading-text.html
If you could explain what exactly you are trying to do we may help better.