Splitting one document into a master document and subdocuments
When you have one existing document that you want to split into several subdocuments that will be controlled by the master document, you can split the document automatically.
Use this method if the original document uses only the Default page style, is numbered sequentially from the first page, and uses the Heading 1 style to identify the start of each chapter. In these conditions, this method will work well.
Advantages: This method is quick and easy, and any existing cross-references between chapters are preserved. Although cleanup work may be necessary, once you have done the cleanup, the document will behave itself.
Disadvantages: If the original document was complex, you may have major cleanup work to do because some formatting will be lost—for example, page styles, page breaks, restarted page numbering.
How to do it: Open the document and click File > Send > Create Master Document to split the document. You will find that each of the subdocuments begins with a Heading 1 and the file names are all maindocnameX.odt, where X is 1, 2, 3, and so on. If you have a Preface or other “chapter” starting with a Heading 1 before Chapter 1, the file names will not directly correspond to the chapter numbers.