[Security Group - Global]

On Windows 2003 server can you add a Security Group - Global as a member of another Security Group - Global? I want to add Enterprise Admins to the Schema Admins group and it does not let me. I can and have added my User to the Schema Admins but not the Enterprise Admins group.

Is this possible?

[3.Disconnect the schema master domain]

I am trying to extend my AD schema and Microsoft says to do the following:

3. Disconnect the schema master domain controller from the network. (http://technet.microsoft.com/en-us/library/bb680608.aspx)

How/where is this done? I have brought up dsa.msc but I don't see where you do this.