TP uses 'Common Europe Check-In' in OPO and others. Any flights out of OPO for TP use the same 5 - 8 desks at the same time. No separate flight check-in desks.
Of course, TP recommends that you check in online and get your boarding card printed at home, which means that you only have to drop the luggage off and get it all over with quickly.
S.