I need to create 7 magazine sites with different theme but some content should be same like some common pages, some pictures. There should be common control panel for all website so that my customer can upload data on all website from same panel. same content is require because customer will upload article on one and it should publish on all site.

I have already setup two demo site with different database on one hosting place and single Drupal installation.

Please help me.

I need to create 7 magazine sites with different themes but some content should be shared (like some common pages, some pictures etc). 

There should be a common control panel for all websitea so that my customer can upload data on all websites from the same panel. The same content is required because the customer will upload articles on one and it should publish on all site.

I have already setup two demo site with different database on one hosting place and single Drupal installation.