听起来你不需要另一个导航菜单。

这样怎么样：

<?php if ( is_page() && $post->post_parent > 0 ) { 
   // we know we are on a sub/child page now...
   // PS. another way to handle this would be to check if you were on a particular page template or particular page ids etc.
?>
<a class="awesome-button" href="<?php echo esc_url( home_url( \'/\' ) ); ?>">Go home!</a>
<?php 
    // just show a link Home for the subpages...
} else {
   // now we are NOT on a subpage, so show the Primary nav menu...
   wp_nav_menu( array(\'menu\' => \'primary\') );
} ?>