How to add child items to QStandardItemModel?

[TheIndependentAquarius]

Greetings,

Idea is to have something like:

> File
.........New
.........Save
>Edit
.........Cut


I have:

int main( int argc, char *argv[] )
    {
.........   
 
    QStandardItemModel model;
 
    QStandardItem *parentItem0 = model.invisibleRootItem();
 
 
    QStandardItem *file_item = new QStandardItem(QString("File"));
 
 
    QStandardItem *new_ = new QStandardItem(QString("New"));
 
    file_item->setChild(1, new_);
 
 
    parentItem0 = file_item;
 
 
    parentItem0->appendRow( file_item );
 
..........   
}

int main( int argc, char *argv[] )
    {
.........   

    QStandardItemModel model;

    QStandardItem *parentItem0 = model.invisibleRootItem();


    QStandardItem *file_item = new QStandardItem(QString("File"));


    QStandardItem *new_ = new QStandardItem(QString("New"));

    file_item->setChild(1, new_);


    parentItem0 = file_item;


    parentItem0->appendRow( file_item );

..........   
}

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This is not giving me anything.
What is the way to add child items to parent items?