How to Sum through current date when data is available for the full month

Hello,

I'm trying to SUM sales information where I have a daily target through the month, but only want to sum what the Month-to-date targets are through yesterday's date.

For example, the dates go by day number, the sales by day are the next row, and below that is the sales target.  Say we're on day 5.  How do I get the targets to sum only through day 5?  I want my report to show 47 for the Month to date total target, but its totalling everything through day 10.

Day:      1        2        3        4        5        6        7        8        9        10     SUM:

Sales: 10       7        5       12      10       -         -         -         -          -          44

Target:11       5        9       10      12     11      15      18      20      16        47

Thanks,

Tim