There is no loop cut node in Geometry Nodes. Is there a workaround to add loop cuts/edge loops in GN?
Note: This answer may no longer be up-to-date for Blender 4.0+. Even if there is still no satisfactory/simple solution for this problem, there may be (computationally expensive or useful for some use cases) alternatives.
This time, unfortunately, the answer is: No, it does not work.
With Geometry Nodes you can only subdivide an existing mesh with the nodes
Subdivide Mesh and
Subdivision Surface. However, neither of these nodes provide any way to specifically subdivide or split in certain areas.
The only other possibility would be to build two (or more) completely new meshes, but this would not be procedurally feasible at the moment due to the multitude of possibilities.
Therefore, this question has to be answered unsatisfactorily, and I'm afraid this won't change in the future.