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If I understand your questions correctly (I am sort of a newbie) ... you go to the Admin/Modules and choose Extended Profiles/Fields. On the upper left there is a clickable link "Add Fields" ... and there you can add what fields you want. You can then add each field to the various categories you have created.
You can create Categories using the Categories option ... and then assign each Field to the appropriate category. To add a category you just click on the "Add Category" link.
HTH
Peter