One sku in multiple products.

[Triyugi]

How can I assign one product into multiple categories?

$data = array();
foreach($data_array as $key=>$value) {
	$data[] = array(
		'_root' => 'Default Category',
		'_category' => $value,
		'_sku' => $key,
		'position' => 1
	);
}

But it only imports one relation.