I've asked question and get comment that it will be better to ask on http://tex.stackexchange.com/. How can I move my question to this? I want avoid to duplicate.
You can vote to migrate a question to another site in the trilogy (SO, SU, SF, and Meta), but currently there's no way to migrate a question to one of the SE sites like tex; you'll need to repost it manually. Usually people just mention in the question that it was originally posted on SO, and include a link to the original question