Installation of multisite

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