add-sub-example.json

{
    "menu-test1_google": {
        "weight": 500000,
        "icon": "/google/icons/google.png",
        "title": "Google Apps"
    },
    "menu-test1_google-webmail": {
        "parent": "menu-test1_google",
        "weight": 10,
        "title": "Webmail",
        "attr": {
            "href": "https://mail.google.com",
            > "target": "_blank"
        }
    },
    "menu-test1_google-drive": {
        "parent": "menu-test1_google",
        "weight": 20,
        "title": "Drive",
        "attr": {
            "href": "https://drive.google.com",
            "target": "_blank"
        }
    }
}