Moved Stock Minus In Item Table To Stock In Itemmoment Table

 helo all...,

i want to make procedure like:
example

i have table:
item (itemid,itemname,stock)
orderdetail(no_order,itemid,quantity)
itemmoment(itemid,itemname,stock)
item table
itemid    itemname    stock
  c1        coconut         2
  p1         peanut          2

orderdetail table
no_order        itemid        quantity
   1                  c1                5

itemmoment table
itemid    itemname    stock
  c1       coconut          0
  p1       peanut            0
 
when customer paid, his quantity in orderdetail decrease stock in item table..
so stock in item table became:
itemid        itemname    stock
  c1            coconut         -3
  p1            peanut           2

it's not good, because stock may not minus...
so i want to move -3 to itemmoment table..
so stock in item table became:
itemid        itemname    stock
  c1            coconut          0
  p1            peanut           2

and in itemmoment table became:
itemid        itemname    stock
  c1             coconut        3
  p1             peanut          0


my store procedure like:
ALTER PROCEDURE [dbo].[orders]
(
    @no_order as integer,
    @itemid AS varchar(50),
    @quantity AS INT
)
AS
BEGIN
    BEGIN TRANSACTION
    
        DECLARE @currentStock AS INT

        
        SET @currentStock = (SELECT [Stok] FROM [item] WHERE [itemid] = @itemid)

        UPDATE [item]
        SET
            [Stock] = @currentStock - @quantity
        WHERE
            [itemid] = @itemid


    COMMIT TRANSACTION
END

it's only decrease stock with quantity. i want move stock minus from item to itemmoment..
can anyone add code to my store procedure?

plss.. helpp.
thxx....