How to change value of GL account on sales order line item

Question

I am trying to change COGS account based on discount percentage. How do I write formatted search?
discount filed is $[$38.15.1] and I need to change COGS account if discprcnt = 100 on sales order
Thanks

Answer 1

Thanks again Jim and Manikadan
I had to modify the query a little bit to following but I was able to change the COGS account on FMS.
Declare @prcntdisc as nvarchar(20)
Declare @acctcogs as nvarchar(20)
Declare @defaultcogs as nvarchar(20)
SET @prcntdisc = (SELECT $[dln1.discprcnt])
SET @acctcogs = '67000015-01-001-03'
SET @defaultcogs = (SELECT C.FormatCode
              from
               dbo.oitb A
               inner join dbo.oitm B on B.ItmsGrpCod = A.ItmsGrpCod
               inner join dbo.oact C on A.SaleCostAc = C.AcctCode
              where
               B.ItemCode =(SELECT $[dln1.ItemCode])
if @prcntdisc like '100.%' 
begin
Select  @acctcogs
end
else
begin
Select @defaultcogs
end