Under the Metadata tab are found the Vocabs. Vocabs are automatically generated when creating form fields for Obiki forms. The value listed in the Field Identifier of the form field becomes the name of the Vocab, which then can be found in the vocab list. In parenthesis after each vocab name is its Field Description, followed by the number of child vocabs, also in parenthesis. Clicking on the [+] sign next to the vocab will show all child vocabs.
New vocabs can be created by filling in the box labeled 'Enter new child title...' and clicking the 'Add' button.