How can I make the Standard IT security Policies in my company several domain. If we have multiple domains how can we deploy single security policy?

You can use Windows Server  Group Policy to manage configurations for groups of computers and users, including options for registry-based policy settings, security settings, software deployment, scripts, folder redirection, and preferences. Group Policy preferences, new in Windows Server , are more than Group Policy extensions that expand the range of configurable policy settings within a Group Policy object (GPO).