Check out the below link..(unary minus operator)

http://www.mcgimpsey.com/excel/formulae/doubleneg.html

If this post helps click Yes
---------------
Jacob Skaria


"ksel" wrote:

Hi, in 1 column I have the name of periods (1 year = 13 periods of 4 weeks:
Period 1, Period 2 etc) and in another column I have the name of customers
(cmr 1, cmr 2 etc).
A third column has the weight of product sold to that customer.
Now I would like to see how much weight was sold to every customer per period:
if you see "Period 1" in column 1, count weight if you see "cmr 1".

In the result, the customer's name is sorted vertically, the periods
horizontally... I tried with SUMIF, but then I have to change the ranges for
every period...

Thanks a lot for suggestions,

Kristoff