Menu after click on page show subpages

Hi, I am sorry if It woudn′t be clear but I am using translated wordpress so I am translating some names back.

I have pages in menu and when I click on some item it gets to the page but I need f. e. page Item which has subpages SubItem1 and SubItem2. So in menu there would be shown Item, then I click on Item it just shows:
Item
–SubItem1
–SubItem2
and then if I click on SubItem I′ll get to some page. I can set abovepage but It′s doesn′t anything. Is there any hack, trick for this? Or maybe some plugin?
And what about that with Archive? First show 2011,2012 then if I click on some year that gets months for that year and after that I get archive for exact month/year.

Thanks, hope It′s clear what I want ??