What all custom workflows can be created in eMAM?

You can create different workflows to automate events and actions. Workflow automation is a set of actions (operations) performed on satisfying a set of conditions provided for an event. 
Each workflow has 2 parts – Events & Actions
Event is a point to start the workflow like Ingest, Custom Metadata Change, Asset Info Change, Button Metadata Click and Cloud Upload. Under each event, we can set one or more conditions so that once these conditions are met, the said actions can be performed. 
Actions: Various actions include Delivery, Archive, Change Metadata, Notify, Manage Category and Manage Project and AI Indexing

You can create multiple workflows with different operations and customize it. Once the workflow is created and is in active mode, based on the conditions set, it gets triggered automatically reducing manual effort. Workflow automation feature can effectively handle multiple workflows to make the system more flexible and also acts as a bridging system for different features in eMAM.
 In the Super Admin interface, go to Workflow tab and click on New Workflow.

 Refer this doc to see few sample custom workflows: Sample Custom Workflows.docx