I know its counter-intuitive and doesn't make any sense at all, but bear with me. I am using the classic thesis style (in lyx), and the recommendation of my university ask me to do so. So currently My structure is something like this
Part 1 Introduction Chapter 1 AAAAA Chpater 2 BBBBB Chapter 3 CCCCC Part 2 Something Chapter 4 DDDDD Chapter 5 EEEEE Chpter 6 FFFFFF
I need it turned into something like this
Part 1 Introduction Chapter 1.1 AAAAA Chpater 1.2 BBBBB Chapter 1.3 CCCCC Part 2 Something Chapter 2.1 DDDDD Chapter 2.2 EEEEE Chpter 2.3 FFFFF
Needless to say, If the esctions and subsections can also ripple down like that That'd be great.
I received a suggestion to use
The results look great. However, classic thesis does not support decimal points in chapter number (and it looks ugly).
So I looked around the net and from this Move chapter number to chapter title in classicthesis, My chapter numbers look more acceptable like this
However, the chapter numbers do not reset when we change parts.
EDIT: The counterwithin command bugs out the pdf bookmark like this, and when I use the LaTeX solution, this doesn't happen.