Thanks Paul,

However, I don't exactly understand exactly how to go about this. So the steps as I understand them should go as follows (?):

1) Insert–>Field...
2)Categories: (All)
3) Field Names: = (Formula)
4)Field codes: =

I am not sure exactly what to do here.

When I type Cmd-F9 in this "=" field nothing happens. Same goes for if I try in a text field, or when I just type in a non-field, normal way. Cmd-F9 is not giving me anything.

Do you know what I am doing wrong?

Thanks