Hi Jasperovic,
1) If the link comes from an automatic menu, just make a custom menu and forget about parent page
2) That is a really different question, if you’re on Linux / Apache server, you’d probably need to edit the .htaccess file in root of WordPress to make all calls to:
website.com/extra
go to:
website.com
or
website.com/motorcycle
But I’m rather sure you don’t need to do that. It’s not recommended to manage that by .htaccess and mod rewrite (there are many tutorials on the net, sorry no link at hand). Unless for example a page is “not real” any more but in good SEO ranks, then you do a “301 redirect” in this same file.
Hope it helps,