Track a flow parameter on a point

Astozzia

hey,

I am running an 2D unsteady case with a compiled UDF of an airfoil.

I would like to monitor the vorticity right behind the trailing edge at a point A. So, I created a point A (Surface>point), but I want it move so that it remains at the same relative position to the airfoil, to which a UDF was prescribed. In that way, I can keep track of the vorticity magnitude at that point throughout the motion.

Can anyone tell me how to make the point a as a zone so that I can hook the same airfoil UDF to it?

Thanks a lot in advance. Astozzia