Conditional formatting for specific field

Hello,

Can someone help with the following please?:

In the sheet "Final" of attached there's a field called "Make appointment Before".
When the value in this column is below 0 I would like it to change to bold and red.
I have tried using conditional formatting but this doesn't work if the field's location is changed.

Note: To change location, select "Show Fields" then "Refresh"

Thanks in advance