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To render a polygon as a subdivision surface, add the RenderMan tab to the OBJ node. Toggle the "Render Polygons As Subdivision" parameter found in the Primvars > Geometry Specific > SubdivisionMesh folderrollout. You will also need to set the Style parameter to Catmull-Clark, Bilinear, or Loop. 

Image Modified

To match geometry from Maya (a common request and our default) you will see:

• Catmull-Clark
• Interpolation: Sharp Creases and Corners
• Facevarying Boundary: New Style, internal only

Details on these settings along with illustrations can be found on the RenderMan page for Subdivision Surfaces

The images below were rendered using the PxrVisualizer integrator in Houdini.