SELECT n.Client_mnemonic,round((([Total Elapsed Time (sec)]/WeeklyUserCount)/60.0),2) AS "Total Time" ,m.WeekMinDate as "Work Week", n.Group_Type,
CASE WHEN m.weekmindate Top 4 THEN 'Baseline' 
             ELSE 'Trending'
           END as "BarType"

SELECT *,
CASE WHEN Seq <= 4 THEN 'Baseline' 
             ELSE 'Trending'
           END as "BarType",
...

FROM
(
SELECT n.Client_mnemonic,round((([Total Elapsed Time (sec)]/WeeklyUserCount)/60.0),2) AS "Total Time" ,m.WeekMinDate as "Work Week", n.Group_Type,ROW_NUMBER() OVER (ORDER BY m.weekMinDate) AS Seq
...

)t