i want to sort data

it is inthe format where i would like to have 3 rows considerd as 1
unit and depending on the highest value in one column they must be
sorted the three rows in itself as well as the entire three sets

an example

col a b c
12345
1 2 3
4 5 6
7 8 9


24567
4 6 4
and it continues
in set of three(rows) in col a b and c


and i am interested in sorting in EXCEL by say column c and want all
three values to be displayed infront of the 12345 no that is the first
row that is empty after the col value.

also once i have sorted the values, i want to make a different sheet
which has all the max values in each row set and sort them too

please can anybody help me with the same