Step 9 of 9 in Making a new edition
Sample data, read from content-sdk
Editions of editions
This is uncommon: most editions start from the original. But one district in the region needs changes of its own, so Ben started Humanities (District) from Humanities (Regional).
An edition can be started from another edition once that edition is published. The district edition took the regional edition's copies as copies of its own.
Try it: select Timeline Exit Ticket in Humanities (District), then compare the other books.
The district's Exit Ticket is a copy of the regional edition's copy. Humanities (Another region) has no Exit Ticket: Ben deleted that row there, and only there.