Organise the document any way is convenient for you. The only restriction is on the TOC. It is a generated table, as a consequence it needs visibility on the whole document so that all headings are collected. Therefore, you should put its placeholder/generation directive, i.e. the Insert
>TOC & Indexes
>TOC & Indexes
command in the master document itself.
To avoid confusion in the future as to what your master document is about, I recommend that your title page, at least is part of the master document. Unless you use a “standard” copyright page shared between several documents, write it also in the master document. The dedication page is also short and specific to a document, there no definite advantage to have it in a separate document.
To summarise, the master document will contain:
- Title page
- Copyright or “Insert” Copyright document
- Dedication
- TOC
- “Insert” chapter 1 document
…
N. “Insert” chapter N document
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