[PunkMeUp]

It seems to me that this option would be available on this great Calibre software but I can't seem to find it or work out how to do it in an easy way. Or, maybe what I have here is a suggestion.

Background of the Problem
I'm not sure if all Kindles are like this, but my mother's newest model basic Kindle shows the chapter markers at the bottom of every page along with an arrow showing the current location when reading a book (both within the chapter and the overall book). It's very handy to see how close you are to finish a chapter and how many chapters are in a book, etc.

A problem with this is that the progress bar only shows the main levels of a Table of Contents (TOC). The kindle completely ignores secondary levels which a book will usually have if it's divided into parts and then into chapters within the parts.

I've been working around this problem in a tedious way and wonder if there is an advanced option for when converting to azw3 or when side-loading on to a Kindle to automate this process.


My current tedious procedure when loading an ePub with a muli-tier TOC onto the Kindle:
1. Make a a copy of the original file elsewhere from the Calibre library
2. Use the 'modify ePub' plugin on the ePub with the 'flatten TOC hierarchy in NCX file' option and let it replace the existing copy.
3. Convert the ePub to .azw3 format
4. Delete the ePub format from the book
5. Open up the medadata editor and drag back in the original ePub back into Calibre
6. (now, when I use Calibre to side-load the books into the Kindle it puts on the .azw3 file with the flattened TOC and all is well on the Kindle)


Thanks for reading!