In System Center 2012 Configuration Manager with no service pack, you cannot change the parent relationship of an ACTIVE site. You can only add a site as a child of another site at the time you install the new site. Because the database is shared between all sites, JOINING a site that has already created default objects or that has custom CONFIGURATIONS can result in conflicts with similar objects that already exist in the hierarchy.

However, in System Center 2012 Configuration Manager SP1, you can expand a stand-alone PRIMARY site into a hierarchy that INCLUDES a new central administration site.

In System Center 2012 Configuration Manager with no service pack, you cannot change the parent relationship of an active site. You can only add a site as a child of another site at the time you install the new site. Because the database is shared between all sites, joining a site that has already created default objects or that has custom configurations can result in conflicts with similar objects that already exist in the hierarchy.

However, in System Center 2012 Configuration Manager SP1, you can expand a stand-alone primary site into a hierarchy that includes a new central administration site.