Follow the procedure for single site installation
After the site has been restored to the destination site please execute the following changes
Database Changes
wpfx_blogs: Update values for new domain and path for each sub-site of the network
wp-config.php Changes
define(‘DOMAIN_CURRENT_SITE’, ‘NEWVALUE’);
define(‘PATH_CURRENT_SITE’, ‘NEWVALUE’);
where the value of PATH_CURRENT_SITE must finish with a “/”
.htaccess Changes
Validate the .htaccess file, so that might also need to be updated, see here: http://codex.wordpress.org/Multisite_Network_Administration#.htaccess_and_Mod_Rewrite