<$include>
<$include:textNameOrPath> You can use the <$include…> placeholder to have text from an external document inserted into the text during Compile. This can be useful if you have text snippets that need repeating throughout for some reason.
To insert the main text of any document in the current project, either use the <$include> tag and apply a document link to the whole tag that points to the document whose text you wish to insert, or use <$include:docName>, where “docName” is the name of the document you wish to be inserted. (Using document links is the more reliable method.)
To insert the text of an external file, either use the <$include> tag with a link to the external file, or use <$include:docPath>, where “docPath” is either the full or relative path of the document whose text you wish to insert (relative paths should be relative to the folder in which the project is stored). Note that only plain text UTF-8 files and RTF files are supported, and only the text of such files will be included (images, footnotes and comments are ignored in external RTF files that are inserted in this manner).
The <$include…> tag is only supported in the following areas: the main text; notes; title prefixes and suffixes; section layout prefixes and suffixes. You can also use it in the ebook “Description” metadata field, but only if it appears on its own.
Will that do it for you?
Mark