If you have troubles since the update to WordPress 4.5 please read this post before opening a new thread.
No, the portfolio thumbnails will always link to a portfolio item. All portfolio thumbnails here: http://wegothoodzpah.com/ also link to a portfolio item page. You can install a redirection plugin though (i.e.: http://wordpress.org/plugins/redirection/ ) if you want to redirect the user from a portfolio item page to another page/website url.
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