![sectioning - How to add an extra level of sections with headings below \ subsubsection - TeX - LaTeX Stack Exchange sectioning - How to add an extra level of sections with headings below \ subsubsection - TeX - LaTeX Stack Exchange](https://i.stack.imgur.com/rE8Nc.png)
sectioning - How to add an extra level of sections with headings below \ subsubsection - TeX - LaTeX Stack Exchange
![cross referencing - (sub)section with number, subsubsection with letter - \ref shows only the letter - TeX - LaTeX Stack Exchange cross referencing - (sub)section with number, subsubsection with letter - \ref shows only the letter - TeX - LaTeX Stack Exchange](https://i.stack.imgur.com/kkAwW.png)
cross referencing - (sub)section with number, subsubsection with letter - \ref shows only the letter - TeX - LaTeX Stack Exchange
![numbering - How to number and cross-reference \subsubsection-level headers - TeX - LaTeX Stack Exchange numbering - How to number and cross-reference \subsubsection-level headers - TeX - LaTeX Stack Exchange](https://i.stack.imgur.com/IsNxf.png)
numbering - How to number and cross-reference \subsubsection-level headers - TeX - LaTeX Stack Exchange
![sectioning - How to add an extra level of sections with headings below \ subsubsection - TeX - LaTeX Stack Exchange sectioning - How to add an extra level of sections with headings below \ subsubsection - TeX - LaTeX Stack Exchange](https://i.stack.imgur.com/uw2Qz.png)
sectioning - How to add an extra level of sections with headings below \ subsubsection - TeX - LaTeX Stack Exchange
![table of contents - Correct hierarchy levels of PDF bookmarks for custom section \subsubsubsection - TeX - LaTeX Stack Exchange table of contents - Correct hierarchy levels of PDF bookmarks for custom section \subsubsubsection - TeX - LaTeX Stack Exchange](https://i.stack.imgur.com/4H4ic.png)