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You want to create a one-way or two-way nontransitive trust from an AD domain to a Windows NT domain.
In the left pane, right-click the domain you want to add a trust for and select Properties.
Click on the Trusts tab.
Click the New Trust button.
After the New Trust Wizard opens, click Next.
Type the NetBIOS name of the NT domain and click Next.
Assuming the NT domain was resolvable via its NetBIOS name, the next screen will ask for the Direction of Trust. Select Two-way, One-way incoming, or One-way outgoing, and click Next.
If you selected Two-way or One-way Outgoing, you'll need to select the scope of authentication, which can be either Domain-wide or Selective, and click Next.
Enter and re-type the trust password and click Next.
Click Next twice to finish.