In the [ExtrTitle] section you can assign text for the extract title to the ExtrStart format or ExtrStart PI marker, whichever you used to designate the start of the extract:
[ExtrTitle] ; doc format = text for title of the extract file, which may use ; macros, including <$$_currtitle> which has the title of the parent ; file. This is ignored if the Title is set for any para in the ; extract file. ExtractStartPara=Title for extract file
Predefined macro variable <$$_currtitle> is the <title> string of the file that originally contained the extracted text; see §27.7 Referencing split and extract files.
For example, suppose your DITA document contains an element mapped to a paragraph format that always marks the start of an extract; for example ProcedureStart; and suppose you want each such extract to have a title that includes the title of the file from which it was extracted. You could achieve this effect with the following setting:
[ExtrTitle] ProcedureStart=<$$_currtitle>: Procedure
If the original file’s <title> string was “Setting up a customer account”, the extract file’s <title> section would be:
<title>Setting up a customer account: Procedure</title>
Note: If you assign [HtmlStyles] property Title to a paragraph format in the extract, the content of that paragraph overrides anything you specify in [ExtrTitle].