By default, each slave site have their own content beause they use their own DB or at least specific table prefix when sharing the same DB.
So the article are specific in each website but also the menu, forum, contact, ...., everything is specific as long as you don't share any DB content.
To share the content between website, you need a specific action.
You can only share the content of a limited number of extensions.
See the list of extension defined in the JMS tool menu
www.jms2win.com/en/list-of-extensions?vi...id=269&Itemid=53
If you want to share the article between websites, see our "article sharing for JMS" that is an additional extension that you can add to JMS in aim to read the articles from another websites.
www.jms2win.com/en/joomla-multisite?page...47&category_id=1
See also the demo
tutorial.jms2win.com/joomla/multisite-12...ingforjms/index.html
The concept of JMS is based on the sharing.
Therefore, there is no duplication of information and no need to synchronize or propagate something as it is physically shared (unique).
That mean that when you update an article that is read by other websites, they are automatically updated.
If you want to reading a shared article in a slave site, you have to change the menu item to make reference to a local article instead of a shared article present on another website.