not tested but try something like
=sumproduct((month(b2:b22)=month(b2))*month(b2:b2 2)<=month(b2)+5)*c2:c22)

--
Don Guillett
Microsoft MVP Excel
SalesAid Software

"Lou" wrote in message
...

I have sales data by month/year, and a release date for each product

eg:

product code date of release Jan-05 Oct-06 May-07Jun-07
1101 01-Dec-04 19 17 6 7
1102 19-Oct-06 22 9 9
1103 07-Sep-06 26 19 13
1104 24-May-07 6 11

hope this helps

Lou



"Bernard Liengme" wrote:

Tell us how the data is arranged
Do we have dates and data
best wishes
--
Bernard V Liengme
Microsoft Excel MVP
www.stfx.ca/people/bliengme
remove caps from email

"Lou" wrote in message
...
I have about 1000 rows of sales data, going back about 2.5 years. I
need
the
first five months sales for each row, but as they were all launched on
different dates, it's proving tricky.

I'm sure there has to be an easier way to do this than selecting the
values
for each row at a time, but just now I can't for the life of me think
how
to
do it!

Any ideas?