Preview configuration properties support hidden views. They will be used to generate subsequent views, but they will not appear in the UI.
To hide a view add the hide property:

"preview": [{
    "xsl": "edm2ese.xsl",
    "label": "ESE",
    "output": "xml",
    "hide": true,
    "preview": [{
        "xsl": "ese2html.xsl",
        "label": "Europeana",
        "output": "html"
    }]
}]

In this example, Europeana will be generated based on ESE, but ESE will be hidden.