For the projectdoc Toolbox multi-transclusion is not only defined to transclude multiple content areas (sections or content marked with the Content Marker Macro), but also transclude from multiple documents at the same time. The use case would be to trasclude the description and resources sections from each glossary item document to provide a condensed view on your glossary.

We do not want to delve into this here, but you you a hint to get started: Look at the Transclude Documents Macro.

Related information to sections and their use in transclusions.

List of tips related to transclusion.