Recognize the first character of column then insert that value to specfic asp:menu

I've this table menu with which I want to save the data in a specific div

when I press save. the query must recognize or read  the first later of primary key like

if its 101. It reads first letter 1 and than enters that value in a specific div

here is the table

I know I have to write the inner query but how please helps

First recognize using SUBSTRING and than insert that in to specific asp:menu

menuCode is the colums that it must read

CREATE TABLE [dbo].[tblMenu](
	[menuCode] [varchar](150) NOT NULL Primary key,
	[moduleCode] [varchar](150) NULL,
	[menuName] [varchar](150) NULL,
	[menuSource] [nvarchar](500) NULL,
	[active] [bit] NULL,
	[ParentCode] AS moduleCode + '-' + menuCode,
)