@Vincent BergI'm not quite sure if you're saying what I think you're saying, but, if you are:
I have a Foreword and a Summary in my current book. SoL numbers them parts 1 and 2, but those are 'behind the scenes.' The first actual chapter is Chapter 1, and so on.
That counts for Post and Repost as well. When I post a new chapter, it's listed as Chapter N, where SoL's numbering and my numbering align.
I imagine this takes some magic on Lazeez's part. I'm unaware of what that magic actually is. From my perspective, 'it just works.'
I imagine that, if I wanted unnumbered chapters, or a gap in numbering, that might be hard, though.