Hi,
Regrettably, this is not supported in Kentico
CMS. You will need to use our API to achieve this.
Please take a look at following link where creating a new site using API is described.
http://devnet.kentico.com/docs/devguide/index.html?creating_a_new_web_site.htm
Adding user to a site can be done with following method (http://devnet.kentico.com/docs/devguide/index.html?managing_users.htm):
CMS.SiteProvider.UserInfoProvider.AddUserToSite(UserName, SiteName);For more information about API please download API reference:
http://devnet.kentico.com/downloads/kenticocms_api.zip
Best regards,
Michal Legen