Seeing your formula would have been a big clue for us to use to offer help.
But I'll stab at it with my butter knife and hope I at least scratch the
surface.
Assume that in A2 you may have something like:
=A1-1
then you could try something like this in A2
=IF(ISERR(A1-1),"",IF(A1-1<=0,"",A1-1))
which would put a zero length string into the cell when value reaches zero.
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