Change URL Structure in Joomla

I have a menu structure like this

1 About_us
1.1 Physicians
1.2 Locations

So when a u开发者_开发问答ser selects Physicians, url will be www.abc.com/about_us/physicians.html

I want to change it to www.abc.com/physicians.html

Any Help?

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You can create a hidden menu with a position called physicians and link to it from the second-level items of your main menu.