input_workflow_type = sbs_graph.addInputParameter( 
      aIdentifier  = 'workflow_type', 
      aLabel    = 'Workflow Type', 
      aDescription = 'Define the workflow type', 
      aUserData   = 'workflow', 
      aWidget    = WidgetEnum.DROPDOWN_INT1, 
      aOptions   = { WidgetOptionEnum.PARAMETERS: "1;0;Custom;1;Metallic Roughness;2;Specular Glossiness" } 
    )

# get instance node implementation from a compositing node 
instance_node = comp_node.getCompImplementation() 
# get the preset list from the graph referenced by the instance node 
presets = instance_node.mRefGraph().mPresets 
# each preset is apply, sbs file saved then cooked and then rendered 
for preset in presets: 
    node.applyPreset(preset.mLabel) 
    # save the doc 
    doc.writeDoc(f"Substance_graph_{preset.mLabel}.sbs") 
    # cook the sbs as sbsar, note use wait() to wait the end of process 
    p = batchtools.sbscooker(f"Substance_graph_{preset.mLabel}.sbs", output_path=f"sbsar") 
    p.wait() 
    # render maps with sbsrender, note use wait() to wait the end of process 
    p = batchtools.sbsrender_render(f"Substance_graph_{preset.mLabel}.sbsar", output_path=f"render") 
    p.wait()