Importing sites in SharePoint 2010 at a granular level can be accomplished only through PowerShell.
Importing is akin to restoring the assets of the site. This can also be done for an item.
This recipe shows how to restore the site from the previous recipe.
An export sites file must exist.
The user must have access to one of the servers running PowerShell 2.0 and the user should be a member of the
WSS_ADMIN_WPG group on the local computer. The user must also be a member of the
db_owner database role and
SharePoint_Shell_Access role in the following databases: