<?php
	// My pages: "Beavers" (ID 1) "Cubs" (ID 2)
	// cParentID is an array of page ID's that.
	// My multi select has these available: Beavers, Cubs.
	// Passing it an array of values for the multi select works like this.
	// I presume addAttribute('scoutnews_article_sections', 'value') would work for a single select
	foreach($this->post('cParentID') as $cPar) {
		$sections[] = Page::getById($cPar)->getCollectionName();
	}

	$p->addAttribute('scoutnews_article_sections', $sections);
?>