With the classic board, you could link fix versions to a parent version, so when a fix version is added to a ticket, the parent is automatically added as well. We used to use the classic board to create the parent relationships, but now that the classic board is gone, is there a new place to link fix versions to a parent.
An example of this:
Parent: Release 5.5
Sub fix versions: Sprint 1, Sprint 2, Sprint 3
So if Sprint 1 is added as a fix version on a ticket, Release 5.5 is also added as a fix version automatically.
