Quick PHP to generate product add-on import string (6 groups of 75)

test.php

<?php

$bar = array();

for ( $group = 0; $group < 6; $group++ ) {

	$options = array();
	for ( $option = 0; $option < 75; $option++ ) {
		$options[] = array(
			'label' => "GROUP $group OPTION $option",
			'price' => '1',
			'min' => '',
			'max' => ''
		);
	}

	$bar[] = array(
		'name' => "GROUP $group",
		'description' => "DESCRIPTION $group",
		'type' => 'radiobutton',
		'position' => 0,
		'options' => $options,
		'required' => 0
	);
}

$foo = serialize( $bar );
echo "$foo\n";