This is something else I desperately need help with at work, but just
can not figure it out. I THINK it is an iteration problem, but I am not
su

Cells A1:A500 contain numbers, all of them 5 or 6 figures.
Cell A501 contains the total of all those numbers, a simple autosum.

Cell B1 contains a number.

The problem:

When you enter a number in B1, all of the numbers in A1:A500 are
increased or decreased by the same amount, so that A501 = B1.

If it helps, these are all positive numbers (dollar amounts), and the
increments and decrements will be very small, maybe a few hundred or a
thousand dollars or so. None of them will fly off into the negatives or
anything like that.

I am thinking of it taking the total of the current numbers and finding
the difference between that and the amount in B1. Then take that
difference and add or subtract it from the numbers in A1:A500...
something like that. But I just can not seem to nail it.

Thanks very much,
Ron M.