Hi:
PROC TABULATE allows the use of the CLASSLEV statement, along with style=<parent> in order to produce "banded" reports, where the calculated data cells inherit their colors from the parent header cells.
In order for this to work, you might have to move your SUM statistic into the COL dimension instead of the ROW dimension. For an example, see pages 17-20 in the PROC TABULATE section of this paper:
http://support.sas.com/resources/papers/stylesinprocs.pdf
cynthia