[TYPO3-dev] Parsing selections in TCA

[ktt]

Hello,

I'm writing a backend extension and have this:

$tempColumns = array (
	'tx_myextendedext_restrict' => array (		
		'exclude' => 1,		
		'label' => 'LLL:EXT:myextendedext/locallang_db.xml:pages.tx_myextendedext_restrict',		
		'config' => array (
			'type' => 'select',
			'foreign_table' => 'fe_groups',
			'foreign_table_where' => 'ORDER BY fe_groups.title DESC',
			'size' => 10,	
			'maxitems' => 20,
			'default' => ''
		)
	),
);

On save it writes results to tx_myextendedext_restrict.
How could be possible to parse the selection results with a function and write the result to other tables as well? So the function could control the writing process and parse the data?

Thank you in advance,
Kast A.