If such two point are available then sure. But in most cases surface partitioning has to be done in CAD software. This is a standard part of geometry preparation for FEM. FreeCAD can easily partition surfaces with sketches thanks to its Boolean fragments tool. But the partition has to extend between the edges, splitting the face into subregions (it can’t be contained within the face because it won’t be recognized and won’t work for partitioning - as shown in Matej’s reply above). I also showed such an example here: Orthogonal shell mesh model - #6 by FEAnalyst