Update function for posts and pages on subdomains

Is it possible with the plugin automatically posts the update?
We consider just buying the plugin!

The plugin should include the following functions:

1. Network capable
2. Distribute the complete contributions to subpages by the network master system
3. by the network master system to update the posts on the undersides

the plugin Can?

It would bring us nothing if we indeed can distribute the posts on bottoms but this could not update a master