Merge 2 Columns T-SQL Ninja Needed

I have this code below, one thing i am trying to do is merge 2 columns, it seems what i have now is suming them can someone give me a hint or two thanks.




Code Snippet
SELECT a.*, b.*, a.Company + b.[Customer Suffix] AS AdditionalColumn
FROM (
SELECT
abCUSA AS Company,
abCUSB AS Account,
0 AS DeliverTo,
abcnam AS [Account Name],
abcad1 AS [Line Address 1],
abcad2 AS [Line Address 2],
abcad3 AS [Line Address 3],
abcad4 AS [Line Address 4]
FROM
LIVEAS400.S65C422B.WRFDTA.PARNADR
) a
inner JOIN
(
SELECT
SLDATE as Date,
SLCUSA as [Compny Number],
SLCUSB as [Customer Suffix],
SLDELN as [Deliber To Number],
SLTREF as [Trans Reference],
SLCNAM as [Customer Name],
-- SLTRT2 as [Trans type],
CASE WHEN SLTRT2 IN (92, 93, 94, 95, 98) THEN SLGDSV * -1 ELSE SLGDSV END as [Goods Value],
CASE WHEN SLTRT2 IN (92, 93, 94, 95, 98) THEN SLVATV * -1 ELSE SLVATV END as [VAT],
CASE WHEN SLTRT2 IN (92, 93, 94, 95, 98) THEN SLTOTV * -1 ELSE SLTOTV END as Total,
SLDESC as [Trans Description]
FROM LIVEAS400.S65C422B.WRFDTA.SQLSLDGR
) b ON a.Account = b.[Customer Suffix]