Project Base Point

The Project Base Point (PBP) defines the local coordinate system (0,0,0) for your building model. 
It serves as a reference for internal measurements, modeling views, and aligning files between different disciplines (e.g., architecture, MEP, and structural).

Key Functions of the Project Base Point 
Internal Reference (0,0,0): It establishes the starting point for your model’s internal dimensions and spot coordinates.
Orientation: It sets the angle difference between Project North (your modeling view) and True North (the actual geographic orientation).
Elevation: It provides a base (0,0,0) elevation that levels and floor plans can reference, allowing you to easily display heights above sea level or building datum

Display Coordinate Origin Points
The Project Base Point and Internal Origin point display in the floor plan view. 
Both Coordinate Origin Points are on by default. You can make them visible or hidden as needed.