A topic with more than two posts can be split into separate topics.
Go into the topic you want to split.
Click
on the Action bar, and select
Split
from the drop-down menu. The
Split Topic
form opens.
Enter the name for the new topic in the New Topic field.
Select posts by ticking their respective checkboxes.
Click to complete.
The new topic will be displayed in the topics list with the new name. The last selected post will become the main entry of the new topic.