Initial articles for alternate titles
Omit all initial articles in added titles (246 fields) except in those rare cases (like "Las Vegas") where the title begins with a proper noun that therefore should be sorted by the initial article.
At head of title notes
Do not record an added title for portions of a title that make no sense standing on their own, as in:
|iAt head of title:|aArco because "Arco" standing alone as a title is unhelpful. Prefer a 500 note along with an added title for the entire title including the at-head-of-title text:
245 00 Preparation for the ASVAB test 246 14 Arco preparation for the ASVAB test 500 At head of title: Arco