Shading in Webi Report

Hi

We have a requirement where in my users want shading across the rows only on cost center groups not on cost centers

E.x. Cost Centre groups starts with BA, BRG, BRRC , BRRCCT etc.. where as Cost centres always with 4 characters starts with 'R' E.x(RAAA, RAAB, RAPV .....etc;)

when i applied shading on column am seeing shading for whole column but where in have to apply shading only for cost center Groups Rows only.

Request all to share your inputs and  thoughts  on this.

Please find the attached snapshot where i highlighted the group rows where i want to shade.

Many thanks in advance!!!

Thanks & Regards,

Kumar V