I have set up a multisite sit network, I need to be able to populate the main site from the sub-sites according to the category.
For instance my main site is called http://www.mainsite.com. Then I have few sub-sites, such as
I want to know who I can populate my http://www.mainsite.com from the post of these sub-sites according to the category. So for instance, in main site I have 3 categories, called sports, business, cinema. So I want to populate the sports from sports.mainsite.com, so and so.
I have seen may networks set up like this. So I know it can be done. can anybody tell me how to do this?