Ok.
So,Im not shure that Google will not see this as duplicate contnet but I will set it like I said - map menu with more categories.
This is what I did.
In K2 parameters-advanced tab I set Use one editor window for introtext & fulltext to no.
That way I get 2 separate editors - one for introtext and one for full text.
When You open K2 item there will be 2 different content boxes,one for intro text and the other one for the full text.,so You can write in intro short text or description of Article.
Also open item view options in category of Your choice and set introtext to hide intro text so it doent show in article (item view).
You can see the result on my blog.
And this is page where I map menu with just one category
www.vienna-airport-cab.at/index.php/de/blog/content/2-taxifahrt
This page is where I will map menu with all categories
www.vienna-airport-cab.at/index.php/de/blog
So at the moment I only have two categories and second one - restaurant is only for demonstration.
Dont get confused if both pages look similar,when I create more categories it will look a lot deferent.