How Create Hirarchy for date column in SSAS 2008?

Hi,

I am working in SSAS 2008. Have a data for one manufacturing company. there is only one large table having near about 5000 rows in that. I have one ActualFinishDate column in this table which is having datetime datatype in SQL Server Database. I have to create a hierarchy for that column as like

Year, Half Year, Quarter, Month, Week, Date

So, please help me how i create a hierarchy from date column using SSAS 2008. or which are the steps to describe the date hirarchy to desigen the cube in SSAS 2008?

Thank you.

Regards,

Parikshit