AutoIncrement Primary Key and Foreign Key in SQL Server

I have 2 tables job order n estimate job order is a primary key in its table

n estimate table include job order but in estimate table estimate order is the primary key so how estimate table job order can auto generate same as in job order table

CREATE TABLE [dbo].[Job_Order](
	[JobNumber] [varchar](30) NOT NULL,
	[Department] [nchar](30) NULL,
	[Budget] [money] NOT NULL,
	[Description] [nchar](200) NULL,
	[FilledBy] [nchar](30) NOT NULL,
	[Date] [date] NOT NULL,
 CONSTRAINT [PK_Job_Order] PRIMARY KEY CLUSTERED 
(
	[JobNumber] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

GO

SET ANSI_PADDING OFF
GO


CREATE TABLE [dbo].[Estimate](
	[JobNumber] [varchar](30) NOT NULL,
	[EstimateNumber] [varchar](30) NOT NULL,
	[Description] [varchar](200) NOT NULL,
	[Amount] [money] NOT NULL,
	[AmountInWords] [varchar](100) NOT NULL,
	[date] [date] NOT NULL,
 CONSTRAINT [PK_Estimate] PRIMARY KEY CLUSTERED 
(
	[EstimateNumber] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

GO

SET ANSI_PADDING OFF
GO