Click on the link "Open Moderation Options", in the topic listing page. Then, after the reload, check the checkboxes related to the topics you want to move. Then go to the end of the page and click "Move". Next page will ask you to which forum you want to move the selected topic.
Proceed and you are done.
Currently is not possible to split topics.
Rafael [originally posted on jforum.net by Rafael Steil]