gud day!

1.) how can i compute the sheet total and grand total of the computed employees compensation?
2.) how can i get the summary of the employees compensation based on the ppa?
3.) how can i group the surname, firstname and MI of the employee?

here it goes:

        name       salary        ppa      employee compensation
lopez, luna i.   11,000.00    A.III.A.2          100.00
cruz, june o.     8,000.00    A. I. A.A           80.00

                                  sheet totaL:
                                  grand totaL:
                                      summary:

urgEnt pLz....heLp me!

tnx in advance....