I am writing my thesis. I have completed all the chapters and other related stuff (e.g., List of Figures, etc.) similar to the other standard theses. But, now I want to break these chapters into "Parts" similar as shown in the attached picture (color is not needed). Also, there should not be an empty page in the writeup for these parts. Please help me.
The picture is the screenshot of the Chicago manual of style online (the link below): https://www.chicagomanualofstyle.org/book/ed17/frontmatter/toc.html
Thanks in advance.