I ran across this old post whilst looking for something else.
To answer the question, "Enter H* to map to an autolevel heading.question."
For more info, see, "Autolevel mappings for headings," in the FM OLH.
"HTML supports six levels of headings. You can convert any FrameMaker paragraph format to a heading by mapping it to Heading (Autolevel). With this special mapping, headings in the document are mapped to H1, H2, and so on, according to their relative levels and based on the highest-level mapping in that file. The advantage of this method is that if the document is broken into separate HTML files, each will always have an H1 mapping and an appropriate hierarchy of headings under that H1."