I entered you transaction data on a worksheet named "My Data" with the same
layout as yours.
My Summary sheet looks like you Sheet, except in B1,C1,D1... I have 10,
11,12.... as I need real number in my formula
I can make these display as Week 10, Week 11, etc by using a custom format
of: "Week " #
In B2 of Summary sheet I have
=SUMPRODUCT(--('My Data'!$A$2:$A$5=$A2),--('My Data'!$B$2:$B$5=B$1),'My
Data'!$C$2:$C$5)
This displays 66.37 as needed
Of course, in reality you will need to adjust the ranges - I worked with
just the 4 rows in the My Data sheet. You will need something like
=SUMPRODUCT(--('My Data'!$A$2:$A$500=$A2),--('My Data'!$B$2:$B$500=B$1),'My
Data'!$C$2:$C$500)
Be careful with the $ to make things absolute and mixed references
The formula is copied down and across as needed
best wishes
--
Bernard Liengme
Microsoft Excel MVP
http://people.stfx.ca/bliengme

"Michael" wrote in message
...
I have a spreadsheet with data that shows transactions for a number of
areas
with a column showing which week the transaction belongs to eg (I have put
row and column headings on for clarity later):

Sheet1

A B C D
1 Area Week No Value Description
2 1 10 52.25 bread
3 1 10 14.12 milk
4 1 11 15.25 bread
5 2 12 28.24 butter

etc

I then want to populate another sheet with these transactions summarised
by
area

Sheet2

A B C D
1 Area Week 10 Week 11 Week 12
2 1 66.37 15.25 0
3 2 0 0 28.24

I can't use a pivot table because I have a number of different worksheets
for different suppliers that are in a different format that also need to
be
shown on the summary sheet.

I'm thinking that this could be done by using a sumif formula on sheet 2
that refers to both the area and week number. Is this possible please?