If you really need the appendices to be subsections you can change numbering of subsections using Then simply use \section for each appendix.
LaTeX provides an exceedingly simple mechanism for appendixes: the command \appendix switches the document from generating Section or chapter numbering is restarted and the representation of the counter switches to alphabetic. So.
Dear LaTeX gurus, I am typing my biology thesis and wish to have an appendix which begins with letter A (e.g. for Chapters: A Chapter 1.