label.from.part boolean label.from.part Renumber components in each part? If label.from.part is non-zero, then numbering of components — preface, chapter, appendix, and reference (when reference occurs at the component level) — is re-started within each part. If label.from.part is zero (the default), numbering of components is not re-started within each part; instead, components are numbered sequentially throughout each book, regardless of whether or not they occur within part instances.