DataSource Controls :: How To Store The Hierarchy Data For The Organization

Here I store the hierarchy data for the Organosation. Under_Level_ID denotes under which Level_ID the current Level is lying. e.g. for Branch the hierarchy in above table will be likeHO-->REGION-->Branch & for ZONE the hierarchy will be same as branch. Now my problem is I need all the hierarchy below a given Level. i.e. if am passing 132 as level then the SP should return me all the hierarchy elements lik Zone, Branch, fgfgfhf, Cluster,

CREATE TABLE [dbo].[T_LEVEL_MASTER](
[Level_Id] [numeric](18, 0) IDENTITY(1,1) NOT NULL,
[Org_Id] [numeric](18, 0) NOT NULL,
[Level_Desc] [varchar](100) NULL,
[RM_SB] [varchar](50) NULL,
[Under_Level_Id] [numeric](18, 0) NULL,
CONSTRAINT [PK_T_LEVEL_MASTER] PRIMARY KEY CLUSTERED
(
[Level_Id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]