The Merge feature in Announcements allows for a central course to broadcast announcements to other courses. For example: a Nursing Program includes twenty different courses, but a single Nursing Program master course or project site can be used to push announcements out to all twenty of the Nursing Program courses.
Select the Announcements tool from the Tool Menu of your site.
Check the box beside the course from which this course will draw its announcement(s), and then click Save.
This image shows the source site with the announcement created.