How can create appendices "numbered" A, B, C within three different sections of a Lyx article document. In other words, I would like Appendix A to be at the the end of my first section, Appendix B to be at the end of my second Section, etc. I tried to use the Document ------> Start Appendix Here, but then I can't continue with the sections.
Usually, appendices are common
In order to get headings such as "Appendix A", "Appendix B", etc. within a section, you could use the next level of depth of sectioning commands, i.e. subsections. Use the starred version to get an unnumbered subsection:
However, in most classes--notable exceptions include