wordpress if parent slug

I want to show a different menu for each group of pages in Wordpress.

How do I say some like...

if slug equals "about" or parent page slug equals "about" show relevant menu.

i.e. I want to show the same menu if the url is...

domain.com/about/

or a sub page of the above

domain.com/about/history

Hope that makes sense.
petewinterAsked:
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Jason C. LevineNo oneCommented:
You would think there is a function for this, but you would be wrong :)

The Codex talks about this in the is_page() documentation. Look at the code snippets, especially snippet 3:

https://codex.wordpress.org/Function_Reference/is_page#Testing_for_sub-Pages

That third snippet gives you the test you need.  You would be applying this in header.php and simply calling different menus depending on the test.
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petewinterAuthor Commented:
Thanks for your help
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