Change pathauto generated URL of node Does anybody know where/how to change the pathauto-URL of a node (that comes out of the db table "url_alias")?

Background (Example):

I have a page with list of nodes (A, B, C)

A -> links to "clean-URL/A.html"
B -> links to "clean-URL/B.html"
C -> should not link to "clean-URL/C.html" but to "clean-URL/A.html" (C has a field that says it should link to A)

So, I want that everywhere there is a link to C, the link should be changed to A. For example in search results or in views.

Unfortunately I can't find a pathauto hook that does something like "render_pathauto_link_of_node"...
I found what I needed. It is the function hook_url_outbound_alter...

function myModule_crawler_url_outbound_alter(&amp;$path, &amp;$options = FALSE, $original_path){
    $mother_nid = $options['entity']-&gt;field_mother_series_nid["und"][0]["value"];
        if( $mother_nid &gt; 0 ){
            $path = "CLEAN-URL/".$mother_nid;
            $options['alias'] = "CLEAN-URL/".$mother_nid;
        }
}


Thanks for helping!!!