Help with mtd ytd and total columns

[Reggie]

to anyone who can help:

i have a workbook that i'm trying to construct that
compiles the total collections/asignments for each atty in
our office. sheet one is a summary of the monthly stats
compiled on sheet two by each month. the ytd total is
derived by =sum() of each monthly total on sheet two. my
problem is how do i arrive at a total to date, a running
total spanning years.

any suggestions and help would be greatly appreciated !

thanks in advance