On Thu, 30 Jul 2009 17:34:35 +0100, "ali"
wrote:

hello

i have values

10
15
20
30
40

...from which i want to subtract 30, starting with the first number and
iterate through my list until i've completed the sum. so for example i would
eliminte the 10, 15 and part of of the 20 to be left with:

0
0
15
30
40

This is the first part of a bigger problem and ideally i'd like to attempt
it without any vba. is this even possible ??


thanks
ali

If you values are in column A starting on row 2 (not row 1)
try the following formula in cell B2.
Make sure that cells A1 and B1 are blank.

=A2-MIN(A2,30-SUM(A$1:A1)+SUM(B$1:B1))

Copy this formula down in column B as far as you have column A data.

Hope this helps / Lars-Åke