Share plugins, themes, and multi post in a multidomain network

Marja,

By default any plugins in the wp-content/plugins directory will be shared across the site. You can Network Activate a plugin so it’s activated on all sites.

For themes, you will need to Network Enable the themes in the network admin panel.

I’m not sure about the posts. That would be a support question for the plugin author that doesn’t match the scope of this QA site.

Hope this helps you out.