Every Typefi publication is made up of one or more Typefi Sections. A Typefi Section is a division within a publication that breaks it into logical chunks, such as chapters in a book. In Typefi Designer, Sections are used to specify which Adobe InDesign master pages to use during the composition process, and in what order; for more information, see Typefi Sections overview (Designer).
The first Typefi component that you must insert in a Word document is a Typefi Section (see Inserting a Typefi Section). This is also the reason you’re prompted to insert a Section when creating a new Typefi document.