Usually, maya import an alembic file from houdini as a whole mesh.
For example a particle system using copy node, create some polygon based on particles' position.
1.Export these polygons as alembic file.
2.Import abc file in maya, in outline the import mesh is one mesh, so we can't select the polygons one by one.
3.If want to the polygons can be selected separately, the geometry(geos need name attribute on primitive) should be packed before export.
4.export again, import to maya.
