go to webadmin console

in listener 80 and 443 , add * or your other domain to your vhost

then add rewrite rule to .htaccess, like following:

RewriteCond %{HTTP_HOST} ^example\.com [NC,OR]
RewriteCond %{HTTP_HOST} ^example2\.com [NC,OR]
RewriteCond %{HTTP_HOST} ^example3\.com [NC,OR]
RewriteCond %{HTTP_HOST} ^example4\.com [NC]
RewriteRule ^(.*)$ http://example6.com/$1 [L,R=301,NC]

restart OLS