{
    "name": "PxrSurface.args",
    "params": [
        {
            "name": "subsurfaceSubset",    
            "widget": "propSearch",
            "options": "prop_parent:context.scene.renderman|prop_name:object_groups",
            "connectable": false
        },
        {
            "name": "singlescatterSubset",    
            "widget": "propSearch",
            "options": "prop_parent:context.scene.renderman|prop_name:object_groups",
            "connectable": false
        }
    ]
}
{
    "name": "PxrSurface.args",
    "params": [
        {
            "name": "subsurfaceSubset",    
            "widget": "propSearch",
            "options": "prop_parent:context.scene.renderman|prop_name:object_groups",
            "connectable": false
        },
        {
            "name": "singlescatterSubset",    
            "widget": "propSearch",
            "options": "prop_parent:context.scene.renderman|prop_name:object_groups",
            "connectable": false
        },
        {
            "name": "volumeAggregateName",    
            "widget": "propSearch",
            "options": "prop_parent:context.scene.renderman|prop_name:vol_aggregates",
            "connectable": false,
            "default": ""
        }        
    ]
}
Use a propSearch widget for PxrSurface's volumeAggregateName.
Use a propSearch widget for
PxrSurface's volumeAggregateName.
