My professional administration entails handling the professional administrative tasks you encounter in your professional career (part of your job). For example, I COULD HELP A UNIVERSITY PROFESSOR with, organizing student submissions, data entry after grading, scheduling classes, editing presentations or creating them, responding to general student inquiries.
Whatever professional you are in, if you believe that you could deligate some general admin tasks that don't require your expertise, I will be able to offer my administrative assistance (sort of like your personal virtual secretary/assistant).
I am an occupational therapist by profession. As an OT, I help people do their best in the activities they have to/need to/want to do.