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Enable the AddMenuItem plugin, input the link and name of the link in the fields, lets say the link is home, going to your home site.
place a link or links like this in your default.master.php where the others are I put it before the activity link.
$this->Menu->AddLink('Home', T('Mobile View'), 'profile/mobile');
$this->Menu->AddLink('Home', T('New Discussion'),'/post/discussion');
Notice the first name is the same, that will place the other links under that link.
see example here