Show Sub Domian / Sub folder blog post on Main domain Homepage

Hi

I searched this forum for my question and id not find suitable answer for the question i have. Sorry if its answered before , please point me to right thread.

Question :

My main domain is : http://www.javamazon.com

my another sub domain is : http://www.javamazon.com/Fashion

When I publish posts on Main Domain this one will be only in visible here , thats makes sense and its true.

When I publish posts on subdomain this one will be only visible subdomain , thats makes sense and its true.

So what I need is how to show posts published in Subdomain in Main Domain Homepage just as it appears its been published in main domain.

Please point me to right resource to implement this logic.

Thanks