Add a costcenter attribute in Windows 2008 R2 Active Directory

Hi All,
I have a requirement to add a costcenter attribute when we create a user in Active Directory.
Can any one please let me know what is the step by step to do that

Thank you for your assistance
RabihhajIT HelpDeskAsked:
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Santosh GuptaCommented:

Adding a new attribute to user is also call "extending the Schema". for this you first need to register the schema so that you can view and edit in schema.

run the command : regsvr32 schmmgmt.dll

then run MMC and open schema console. Modification in schema is higly risky task till you could not understand that what you are doing or what you are going to perform.
Please fo through the url completely then proceed.

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