Make section a "sub-chapter" (at lyx)

Question

I'm writing my thesis in lyx, with using this basis.

I want to set the big headlines as "chapter" (like Overview for example), and I wad the section below numbered as "sub-chapters". Means: the first headline below chapter 1 numbered as 1.1.

Right now, the Chapter class isn't even inside the hierarchy of the numbering.

for example, the hierarchy right now is: Chapter 1 - Overview -> 1. section. -> Chapter 2 - blabla -> Chapter 3 - blablabla -> 2. section.

instead of: Chapter 1 - Overview -> 1.1. section. -> Chapter 2 - blabla -> Chapter 3 - blablabla -> 3.1 section.

I'm new on this forum, so sorry if the question isn't clear. I'll be happy to edit if it needed. Thanks!

Answer 1

It seems I misunderstood what you want (and I'm not the only one). To have the chapter number in front of the section number, load the chngcntr package and use

\counterwithin{section}{chapter}

This will reset the section number at each chapter, and prepend it with the chapter number. Note this is the normal behaviour in standard classes with chapters, so this is needless.

This variant:

\counterwithin*{section}{chapter}

resets the section number at each chapter, but doesn't prepend it.

As to \counterwithout{section}{chapter}, it doesn't reset the section number, so you obtain a continuous numbering of the section throughout the document, independently of the chapters, somewhat like chapters w.r.t. parts in standard classes with chapters.