Process automation deals with runbooks. You can see all of it in this pane:
You could add your (existing) runbook manually or using the gallery:
As you can see, a runbook could be created in two ways: using a text editor or a graphical editor for setting up the basic structure:
It could be a PowerShell workflow, too. If you have your existing workflows from Orchestrator or anything else, you just could add them with minor ...