Usage with columnFields

<?php$GLOBALS['TL_DCA']['tl_theme']['fields']['templateSelection'] = array
(
'label' => &$GLOBALS['TL_LANG']['tl_theme']['templateSelection'],
'exclude' => true,
'inputType' => 'multiColumnWizard',
'eval' => array
(
'columnFields' => array
(
'ts_client_os' => array
(
'label' => &$GLOBALS['TL_LANG']['tl_theme']['ts_client_os'],
'exclude' => true,
'inputType' => 'select',
'eval' => array
(
'style' => 'width:250px',
'includeBlankOption' => true
),
'options' => array
(
'option1' => 'Option 1',
'option2' => 'Option 2',
) ),
'ts_client_browser' => array
(
'label' => &$GLOBALS['TL_LANG']['tl_theme']['ts_client_browser'],
'exclude' => true,
'inputType' => 'text',
'eval' => array('style'=>'width:180px')
),
)
)
);
?>

Usage with callback

<?php$GLOBALS['TL_DCA']['tl_table']['fields']['anything'] = array
(
'label' => &$GLOBALS['TL_LANG']['tl_table']['anything'],
'exclude' => true,
'inputType' => 'multiColumnWizard',
'eval' => array
(
'mandatory' => true,
'columnsCallback' => array('Class', 'Method')
)
);
?>

More information

More information can be found in the contao wiki http://de.contaowiki.org/MultiColumnWizard