What about Vocabularies?
The process is somewhat similar, but the methods are a little different. In a Policy, you need to add the Policy, and then deploy it (optional) if you want it active. For a Vocabulary, you just need to add it, since Vocabularies don't get deployed.
Also, if a Policy uses a Vocabulary, the Vocabulary needs to be added first (much like an assembly reference).
The code snippet below gives an overview of how I accomplished this.
