If I don't want some topics to show at "Show new replies to your posts." anymore is there anyway to do that?
No, use Watchlist like everybody (not entirely true) else so you can use "unwatch".
It would be much easier to be able to do so, shame it isn't possible
Now I have added all answered topic to my watch list and I will unwatch those I don't want to see anymore.
And I'm so used to click "Show new replies to your posts." link that it will take long time to that I learn to click correct link
Its just a little lower and the Watchlist is very powerfull. You can watch entire boards [1] and will find every new topic in your watch list.
[1] https://bitcointalk.org/watch_board.php
