Use Options > Work Environment > Apply Profile > MEP Engineering Profile.
In the MEP profile:
•The toolbox displays the MEP tools (these tools are also available at Design > MEP Engineering tools)
•The MEP Toolbar provides shortcuts to frequently used MEP commands
MEP Tools and Commands
•Turn on view toggles to help you create an accurate MEP model:
–Show MEP Reference Lines
–Show Open MEP Connections
