Title 1
Title 1 takes care of a page break and an entry in the generated table of contents.
Title 2
Title 2 provides an entry in the table of contents as x.1 + n
Title 3
Title 3 provides an entry in the table of contents as x.1 + n.1 + m
etc.
Page break
To generate a manual page break during export, the following element must be inserted in the text: 
The element can be found under "+" → "Other macros" → "Formatting" → "Scroll Pagebreak"
Export
When exporting please always use the option "Default Template (Only this page)".
The export can be found under "..." → "Export to pdf"