The Release Workflow can be created from the Part Profile Card.

You can then generate the "Precondition Report" that checks the following pre-requirements:

• Part needs to be in "Approved" or "Replaced" lifecycle state.
• The initiator of the Workflow needs to have the Equipment Owner role in Design Code set on the Part

If all them are fulfilled, you can launch the Workflow that will make the lifecycle state of the Part evolving to Released. 

Complete documentation: Release Workflow FAQ