User blog comment:Gideoncrawle/Third Wikiversary Special/@comment-3483396-20130211033927/@comment-1874924-20130211042244

There's no "conversion" involved, because works pages don't have the actual text of the story, just a link to it. To set up a tropes page for your story, write a brief description (typically a few paragraphs or less) and list examples of tropes that are present in the story. If I'm not mistaken, the rule is that you must have at least three trope examples to launch a page. In addition, your account--you must get an account, because they don't allow anonymous posting anymore--has to be at least a couple of weeks old before they'll let you put in external links. That's an anti-spamming rule.

Once you have launched the page, you'll need to cross-wick, i.e. copy the trope examples from the story's page to the trope pages. In all probability, that will require rewording the examples somewhat. Crosswicking is necessary because that's how people will become aware that your new page exists. See their articles, How To Create a Works Page, How Indexing Works, and the Administrivia section in general for more details.

One thing to keep in mind is that, while setting up a tropes page can be a good way to publicize your story, once the page is launched you have no ownership over it at all--anyone can edit it. That's actually a good thing, because you're hoping that other people will add trope examples that you missed.