Project Properties
Create properties containing common information (e.g. a support email address, or a product name) that can then be used in Topic content, Topic Titles or Table of Contents nodes. If the common information changes, it only then needs updating in one place.
Define Project Properties and related values in the Project Settings or Build Profile editors.
Reference the property in Topic content using the %% delimiter ..
And when the Topic is generated the Project Property value is used instead: