Question

How do you format an APA style outline?

Answer 1

http://owl.english.purdue.edu/owl/resource/544/03/

http://examples.yourdictionary.com/apa-outline-format-examples.html

When creating outlines in APA style, roman numerals define the main topics in a project. The second level, or sub-topic, should be specified with capital letters. Third level topics, subsumed in second level subject matter, are denoted with Arabic numerals, followed by lowercase letters for fourth-level topics. Note that not all four levels are mandatory when creating an APA outline, but each level should contain at least two headings.
Important stylistic concerns include making sure that each heading and subheading maintains parallel structure. Top level headings should be coordinated so that each one contains level of the highest importance, and subheadings should contain more specific, or subordinate, information.

Hope this helps!