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 [HTMLParaStyles] property Title to a paragraph format in the extract, the content of that paragraph overrides anything you specify in [ExtrTitle].