I have a spreadsheet that contains two columns, one is the date (m/yyyy
format) and the other contains cost associated with the date. I would like
to have a running total by year of the associated cost entered for that date.
So when I enter in a new date/cost, (ie: 4/2008, cost=$1200) my 'total' cell
for 2008 would then add this new cost in.

I know there is a way to do this, just am stumped as to how. I'm thinking I
would use the 'sumif' function? If anyone can tell me what my formula would
be, I would appreciate the help.