An aerofoil presenting an angle of attack to the relative airflow will experience a single force.
Of course there are in fact millions of forces acting on an aircraft in flight.
What Physics does is to say can we pretend there is only one, or two or three etc and get the correct predictions (-ish) whilst making the mathematics simpler.
So the answer to your question depends on what you are trying to do. As an example if you want to explain the effects of propellor wash you are going to have to consider two lateral forces on the airframe, perhaps one at the centre of mass and one at the centre of the fin.