Hello guys, i have one hard question, is it possible so category in frontend write lets say 2016, but i backend it write 2016-k and 2016-s, because i will have have same year but 2 difrent items so in backend i know wich 2016 to choose.

if y can gimme some tips

Hello,
You can change the item's title (and the alias)
Another way to differentiate between categories, you can use a sub or parent category.

i know you wont get me, this is hard , what i want is difrent show in backend and frontend, i wanna in backend it show: this is example "2016-proba"
and in frontend show "2016" without this word "-proba"

do y get me now

You can use a str_replace in your overrides to remove a part from the title you do not want shown.