Difference between university/departmental service and extracurricular university service on CV
Extracurricular service is things you do completely outside the university setting. Volunteering at a food bank or such like these days. Tutoring disadvantaged kids.
The other is service given to the university and its students and staff in some way. Being chair of an admissions or hiring committee. Writing a report, or serving on a committee that is trying to make plans for the future.
There is also an overlap area. If you lead an informal campus Judo club or Chess club, just because you want to, you can probably list it either place, but &quot;extracurricular&quot; is more literally true.
They should probably be separated if the instructions separate them. But if they just ask for service without qualification, you could probably combine them.
And the required activities under Teaching and Research are separate, as you suggest.