Perform these steps to extend the Active Directory schema with a new attribute:
- Open a Microsoft Management Console window (mmc.exe).
- From the File menu, select Add/Remove Snap-in.
- From the left-hand list of Available snap-ins:, select the Active Directory Schema snap-in. Click the Add > button to add it to the right-hand list of Selected snap-ins:
- Click OK.
- In the left navigation pane, expand Active Directory Schema.
- Right-click the Attributes folder and select Create Attribute from the context menu:
- Click the Continue ...