SQL QUERY COUNT THEN ADD

Its sum value by each order u will need. According to your original question orderamount <100 then add 5

    WITH cte
AS (
    SELECT OrderID
        ,OrderDate
        ,Customer
        ,ProductAmount
        ,sum(orderamount) orderamount
    FROM mytable
    GROUP BY OrderID
        ,OrderDate
        ,Customer
        ,ProductAmount
    )
SELECT OrderID
    ,OrderDate
    ,Customer
    ,ProductAmount
    ,CASE 
        WHEN orderamount < 100
            THEN orderamount + 5
        ELSE orderamount
        END Orderamount
FROM cte

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