I assume you have existing equations in these cells
eq(b5),eq(c5),eq(d5)
It is real easy to get into circular references with this type of logic.
Try
in b5
=if(or(eq(c5)=400,eq(d5)=400),0,eq(b5))
in c5
=if(or(eq(b5)=400,eq(d5)=400),0,eq(c5))
in d5
=if(or(eq(c5)=400,eq(b5)=400),0,eq(d5))
"CP" wrote:

Hi,

I have 3 cells (B5, C5 and/or D5) that need to meet a
certain criteria without going over the maximum in any
combination of the 3 cells. The maximum is $400. Any of
these cells can be equal to $400, but if one or two gets
to $400 first, how do I make the ones that are less than
$400 say zero?

(I have a small file to send if needed)

Thanks, CP