public class MainBox extends AbstractGroupBox {
    public class MyTableField extends AbstractTableField<MyTableField.MyTableFieldTable> {
      public class MyTableFieldTable extends AbstractTable {
        // additional code with columns here..
      }
    }
}

MyTableRowData[] formRows = formData.getMyTable().getRows();
    for (MyTableRowData row : formRows) {   
      if(ITableBeanRowHolder.STATUS_INSERTED == row.getRowState()) {
        SQL.insert(SQLs.INSERT_STATEMENT
            , new NVPair("value1Formdata", formData.getValue1())
            , new NVPair("valueXFormdata", formData.getValueX())
            , new NVPair("valueXRowData" row.getValueX())
            , row);
      } 
    }