What commands do I put in my preamble to set enumeration labels once and for all for a document. I'm not finding it easy to get this information from Bezos's instructions in enumitem.pdf.
I want my lists to follow canonical outline ordering: capital Roman for top level; capital alphabet for next level; arabic for next level; lowercase alphabet for next level.

Roman, A,arabic,ain the other question and showed the possible use of options here – Sep 23 '15 at 18:41