How to make dropdown menu wordpress?

How to make wordpress so when you click on menu in the sidebar (sidebar menu some menu items have sub-items) is passed to the page and if the menu item has sub-items to it aside (on a new page). For example, in the menu, I click on the "Travel" => goes to the page "Travel" => On this page has already the menu opened and now consists of "Moving" : "Moving office", "Moving home". I will be grateful for the assistance did not adequately found in the Internet, so as not imagine how this function is to describe
July 9th 19 at 11:08

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