sum based on criteria

how do i get the sum for the remaining headers? -4,-3,-2,-1....8

on the sheet labeled blad1 it shows the aggregate total for Jun12, jul12, and aug12....how do i view it by month...i.e. jun12 totals, jul12 totals and aug12 totals separately? I do like being able to check/uncheck boxes to indicate which one i want included or excluded from the totals...

thanks

For excel 2007:

Pull (in the pivot table) the month in sigma value.

If you want to see only one month, you only select the wanted month.

Do you have questions, just ask.