When printing project list you can output smth like that:

// trying to show orphan's parent

$t_main_parent = project_get_main_parent_project($t_project_id); // I made function to get parent

if( $prev_main != $t_main_parent['id'] && $t_main_parent['id'] != $t_project_id )

$t_main_parent_name = "[subproject of " . $t_main_parent['name'] . "] ";

else

$t_main_parent_name = null;

$prev_main = $t_main_parent['id'];

if( $t_level > 0 && is_null($t_main_parent_name) )

$bold_open = $bold_close = "";

else

{

$bold_open = "<h3>"; $bold_close = "</h3>";

}

Then goes HTML output now...
where I've changed:

<a href="manage_proj_edit_page.php?project_id=<?php echo $t_project['id'] ?>"><?php echo $bold_open . str_repeat( "» ", $t_level ) . string_display( $t_main_parent_name . $t_project['name'] ) . $bold_close ?></a>

I'm sure it will become outdated, but I hope it will show the idea (: