I wrote a nested if to add a description based on a column's value, like this:
=IF(A2<0,"No Activity", IF(A2>180,"No Activity More than 180 days", IF(A2>150,"Within 180",IF(A2>120,"Within 150",IF(A2>90,"Within 120","Within 90")))))
It's a little awkward, I wonder if there's any other neat...