First of all you must mention from now onwards which version of Pro/E you are using. Its because WF is a totally different version than its previous version. Anyhow go to advanced then drawing setup and then search for what you want and change it. This is in 2001. In WF from File Menu click on properties, and drwaing setup.
I have managed to turn them on now and change the standard to ISO, but I was looking at showing the dimensions with tolerances in the same way as Autocad does instead of just showing an upper and lower measurement.
AutoCAD shows the absolute dimension value with a little +/- ... value next to it.
Uni upgraded to wildfire last september from 2001 so I'm using wildfire now.