[C-novice]

I'm using Calibre 4.3.
I have a 5 part, 89 chapter book made in LO. appx 280K words.

I brought it into Calibre to convert as an epub but Calibre only provide TOC for the Heading 1 titles which are Part 1, Part 2, etc. Chapters 1 - 89 are styled as Heading 2 but those did not show up in Calibre's generated TOC.

E.g. Chapters 1-4 are subheadings (Heading 2) under Part 1, Heading 1; chapters 5 - 26 are Heading 2 under, Part 2, Heading 1 and so on.

However they show quite okay when I opened the Calibre generated epub in Sigil.

I did not create a TOC in LO because I did not want each heading to be connected to a page # as LO would do.

Anything I should have done and haven't done why Calibre hasn't shown the subheadings under each main heading?

FYI: epub check is fine in both Calibre and Sigil.

thanks

Edit:
I think I got it by re-generating the TOC in Edit Book. I have to delete the previous entries one at a time and still don't know what I did wrong that prevent the H2 headings being included in the TOC.