How to Update Over using Triggers

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SQL

CREATE TABLE Table1
(
ID int IDENTITY(1,1),
clmA varchar(50) NULL,
clmB int,
PRIMARY KEY (ID) 
)

Insert into Table1 values('A',5)
Insert into Table1 values('B',2)
------------------------------------------
CREATE TABLE Table2
(
ID int,
clmA varchar(50) NULL,
clmB int 
)
-------------------------------------------------------------------------
CREATE PROCEDURE dbo.ProcTable1
(

 @clmA VARCHAR(50),
 @clmB INT
 )
AS
BEGIN 
DECLARE @ID INT
  UPDATE Table1 SET clmA=@clmA, clmB = (clmB + 3) 
  WHERE ID = @ID
END
BEGIN 
DECLARE @ID INT
  UPDATE Table2 SET clmA=@clmA, clmB = (clmB - 3) 
  WHERE ID = @ID
END

-- Excut
--------------------------------------------------------------------------
CREATE TRIGGER TrG ON dbo.Table1
FOR INSERT
AS

DECLARE @ID int
DECLARE @clmA varchar(50)
DECLARE @clmB int

SELECT 
@ID = i.ID, 
@clmA = i.clmA,
@clmB = i.clmB
FROM inserted i;

INSERT INTO Table2(ID, clmA, clmB)
VALUES (@ID, @clmA, clmB + @clmB);
------------------------------------------------------------------------------
CREATE TRIGGER TrgN ON dbo.Table1
FOR UPDATE
AS

DECLARE @ID int
DECLARE @clmA varchar(50)
DECLARE @clmB int

SELECT 
@ID = i.ID, 
@clmA = i.clmA,
@clmB = i.clmB
FROM inserted i; 

UPDATE Table3
SET 
ID = @ID,
clmA = @clmA,
clmB = (clmB - @clmB)-- how to do this here there is wrong NOT to duplicate
WHERE ID = @ID

---------------------------------------------------------------------
-- The question is? I need the trigger to tell in table2 the value has been add.. Not to tell the value has been updated in the row in table1.
-- example: Insert into Table1 values( 'A' , 5 )
-- if we Update this value in Table1 the column2 has value 5 to be +3 Over 5.. I mean 3 plus 5 = 8 .. I need the trigger to tell in table2.' . 3 . is added.. but in new row.. Not 8 in the same row with duplicate. also if 5 - 3 = 2 this will insert with update to table 3..
-- Like this
Table 1
-- ('A', 5) Old row

Table 2
-- ('A', 3) New Row .. this row should fire by Trigger for INSERT and UPDATE
-----------------
Table 3
-- ('A', 2) New Row .. this row should fire by Trigger for INSERT and UPDATE
------------------------------------------------------------------------