It sounds like you do not have the formulas aligned with the range you are selecting.
Note the formula he gave you:
Code:
=COUNTIF($D$6:$D$120,A61)>0
That would work for an entry in cell
A61.
The way to do this for multiple cells is to first select all the cells you want to apply this Conditional Formatting too.
Then, enter the formula as it pertains to the
very first cell in your selection.
If you use absolute/relative referencing correctly, Excel will automatically adjust it for all other cells.
So, if you are looking to apply this to A6:A493, first select that exact range.
Then, enter this CF formula:
Code:
=COUNTIF($D$6:$D$120,[COLOR=#ff0000]A6[/COLOR])>0
and choose your formatting option.