Conditional defines with C++Builder 2006/7 Project action?

I need to build several C++Builder 2007 projects and to do so I need to set various conditional defines which determine the product version (Std vs Pro etc), branding and other settings.

Previously I was building C++Builder 6 projects and there was an option to set conditional defines in the action. With the CB2007 project action there are few options. What does the "Make options" option do on the Project tab in this action? I tried that but it doesn't appear in the log file so I'm not sure how it's used. The project is built ok but I can't vary the conditional defines.

Is there a way to vary conditional defines with this action? Do I need to do a text replace on the .cbproj file?

Cheers.