Groups the Row groups in which correct values falls into it

i have a table(matrix) in my ssrs,in my row groups i have student data  in which 3 values falls into it.a)John, Sam and Mary
im my datasets i have 2 data , Teachers and Surpervisor as column.this display the total number of students,
So in my student row i want to match only those values to both Teachers and Supervisor.
eg

here is what my table look like when i run it

---------------------------------
         Teacher    Supervisor

--------------------------------------

john ---  56            0
---------------------------------
Sam       0           112

Mary

---------------------------------

the value 50 and 112  should be a constant value and also since Student is in row group how can i group john to separate
from Sam and Marry.