SharePoint 2013 dynamic Navigation for Site

Hi All,

I am building a site in SP 2013 and have a question on the navigation. Initially we will have 4 items in the global navigation as: 
Page 1 Page 2 Page 3 Page 4 
Now, based on the user selection, I will modify the navigation and show it like this, suppose If a user goes into a section of Page 1: 
Page 1 Section 1 Page 2 Page 3 Page 4 

If a user goes into a section of Page 2: 
Page 1 Page 2 section 2 Page 3 Page 4 
How can I acheive something like this? Should I show them as a term and then show/hide them based on the selected section?

Thanks,

Deepak

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