How to properly load a CCB scene with sub CCBs?

I am quite new to cocos2dx and I am currently facing a problem with cocosbuilder scenes that have CCBNodes in them.

I am able to load and run regular CCB files, but I am having a hard time saying the same with nested CCB files.

The scenario I am facing is like this, I have a CCB file that has another CCB file in it. I want to know how to properly load this. Can someone teach me how to do this?