Allow a runbook to be able to be run from another runbook
With standard octopus deployment there is a "deploy a release" step which can be used to run other projects from a parent project.
It would be usefult o have a similar "run a runbook" step to be able to build up run books from smaller steps into bigger processes.
Our use case is swithcing to DR, there are numerous steps such as stopping various services, starting other services, stopping replication etc. But, each of these steps is also useful in itself so we have steps effectively duplicated, once in the invoke dr runbook and once in a runbook all by their lonesome. But, the data and process is identical across them all.

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Douw Loots commented
Potential workaround here: https://octopus.com/docs/octopus-rest-api/examples/runbooks/run-runbook