This is probably the error message you are receiving, correct?
Msg 10706, Level 16, State 1, Line 27
Too many expressions are specified in the GROUP BY clause. The maximum number is 32 when grouping sets are supplied.
For a GROUP BY clause that uses ROLLUP, CUBE, or GROUPING SETS, the maximum number of expressions is 32. You will have to remove one of the grouping sets to get the query to finish successfully. Here is a link on GROUPING. http://msdn.microsoft.com/en-us/library/ms177673.aspx
If you drop column 33, the query would run.
declare @tbl table (Col1 int,Col2 int,Col3 int,Col4 int,Col5 int,Col6 int,Col7 int,
Col8 int,Col9 int,Col10 int,Col11 int,Col12 int,Col13 int,Col14 int,Col15 int,Col16 int,
Col17 int,Col18 int,Col19 int,Col20 int,Col21 int,Col22 int,Col23 int,Col24 int,Col25 int,
Col26 int,Col27 int,Col28 int,Col29 int,Col30 int,Col31 int,Col32 int,Col33 int,col34 int)
insert @tbl
select 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34
union
select 10,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34
union
select 20,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34
union
select 30,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34
union
select 40,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34
--SELECT * FROM @tbl AS t
select SUM(Col1) Total,Col2,Col3,Col4,Col5,Col6,Col7,Col8,Col9,Col10,Col11,Col12,Col13,Col14,Col15,
Col16,Col17,Col18,Col19,Col20,Col21,Col22,Col23,Col24,Col25,Col26,Col27,Col28,Col29,Col30 from @tbl
group by
grouping sets ( (),(Col1,Col2),(Col1,Col2,Col3),(Col1,Col2,Col3,Col4),(Col1,Col2,Col3,Col4,COL5),
(Col2,Col3,Col4,Col5,Col6,Col7,Col8,Col9,Col10,Col11,Col12,Col13,Col14,Col15,
Col16,Col17,Col18,Col19,Col20,Col21,Col22,Col23,Col24,Col25,Col26,Col27,Col28,Col29,Col30,col31,col32))