I have a cell, with a value that's negative, until another cell is
changed from "no" to "yes" - what I would like is that the original cell
changes value from <negative value to <positive value when I change
the "yes/no" cell.

Quick example:

In column D I have several values, each originally negative (these are
payments not yet received) - and marked in column F (same row) with "no"
- when I receive payment, I change the "no" to a "yes", and manually
changes the corresponding cell in the same row to a positive value.

Is it possible to automate this? So that when I change the value in
column F, row <something, I get a corresponding result in colum D, row
<same something?

--
mvh
Ørjan Langbakk
http://www.bergenpchjelp.no