Normally column C in my workeet is an eqaution eqault to
a minus B, where A is an equation and B is a value.
Occasionally, I have a user who wants to override the
eqaution in C with a vlaue. In that instance, he wants to
work backwards and replace the usual eqaution for A with A
= column B + column C.

Is there a function that will be able to tell cell A5 that
cell C5 is not an eqaution anymore but, rather, a diectly
entered value, a value that might even be entered as zero?

If not, is there another easy way to do this? I suppose I
could add an extra column with a yes/no for each row, as
to whether there is an over-ride, but I would like
something simpler.

Thx,
G