New IPDFUtilities COM interface introduced to the COM automation feature, supporting the programmatical output of multi-page PDFs
The built-in PDF library, which provides functionality for merging two or more PDF documents into one, is now accessible via the COM automation interface, so script/plugin writers can use it instead of relying on third-party tools or PDF printer-based solutions.
Refer to the latest COM documentation for full details.
An example of a multi-part PDF report, possible through the GUI since Impact 2019, and now through COM in Impact 2019 R2
See also: Overview of Automation, Export multiple layers to a single file if supported (non Impact formats only)