What I'm trying to do is create a submenu (in Joomla! backend) with below code but it does not work.
JSubMenuHelper::addEntry(JText::_('test'), 'index.php?option=com_test&controller=test', $controller == 'testcon');
I have attacted a sample pictures here. It explains what type of menu I want.
sample menu is here. check this picture
Thanks!