Click Start, point to All Programs, point to Administrative Tools, and then click Active Directory Users and Computers.
In the console tree, double-click the domain node.
Where?
Active Directory Users and Computers/YourDomain
Right-click the folder in which you want to add the group, point to New, and then click Group.
In the New Object – Group dialog box, type the name of the distribution list under Group Name, select the group scope that you want to use, and then select the group type Distribution.