This example shows how to create a sub-story within a tiddler that is independent of the main story.
Here's the code:
<$navigator story="MySubStoryList" history="MySubHistoryList">
Click this link to get started: HelloThere
<$list filter="[list[MySubStoryList]]" history="MySubHistoryList">
<div>
! <$button message="tm-close-tiddler" class="tc-btn-invisible">{{$:/core/images/close-button}}</$button> <$view field="title"/>
<$transclude mode=block/>
</div>
</$list>
</$navigator>