Keep old permalink when change page from a parent to a child. WordPress

Lew Ayotte answers:

There are several ways to do this... probably the easiest:

1) Create a parent page named ask-matt, install the Redirect plugin, add a meta tag to that page "redirect" w/ http://www.mattzito.com/mattzito/ask-matt/

or a little more difficult, but easier to manage:

2) You can also do this by installing the Redirection plugin, create an htaccess redirect using that plugin to redirect /ask-matt/ to http://www.mattzito.com/mattzito/ask-matt/

Have fun :)

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