Question : SQL trigger- only insert select details

I have a trigger shown in the snippet,

It inserts the records in opdetm joined by opheadm.order_no = opdetm.order_no, into opdetm_audit when opheadm's status is updated to 9,

what i want to add now is that it will only add the opdetm records that do not exist in opdetm_audit2 (this is not a typo, there is an audit and an audit2 table)
joined by
opdetm.order_no = opdetm_audit2.order_no and
opdetm.order_line_no = opdetm_audit2.order_line_no,

How would this be done?

Code Snippet:

         
           
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             ALTER TRIGGER [scheme].[metauddel]
   ON  [scheme].[opheadm] 
   AFTER UPDATE
AS 
BEGIN
	-- SET NOCOUNT ON added to prevent extra result sets from
	-- interfering with SELECT statements.
	SET NOCOUNT ON;
IF UPDATE (status)
 
declare @Status char(1)
declare @OrderNo char (10)
declare @OrderLineNo char(1)
declare @DateEntered datetime
declare @Exist float
 
select @Status = [status]from inserted with (NOLOCK)
select @OrderNo = order_no from inserted with (NOLOCK)
select @DateEntered = date_entered from inserted with (NOLOCK)
 
if @Status = 9 
	Begin
		Insert into opdetm_audit (order_no,order_line_no,line_type,order_line_status,order_qty,despatched_qty,allocated_qty,val) 
Select 
		order_no,
		order_line_no,
		line_type,
		order_line_status,
		order_qty,
		despatched_qty,
		allocated_qty,
		val
 
from [scheme].[opdetm]with (NOLOCK) where order_no = @OrderNo
and @DateEntered < CAST(FLOOR(CAST(GETDATE() AS FLOAT))AS DATETIME)
 
	End
 
END

           
         

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Question : SQL trigger- only insert select details

Answer : SQL trigger- only insert select details

I figured it out myself, i just do a left join on the opdetm_audit2 where order no is null