The Ansys ICEM CFD environment can combine CAD surface geometry and triangulated surface data into a single geometry database (tetin file) using the geometry interfaces. All geometry entities—including surfaces, curves and points—are tagged or associated into a grouping called a part. With this part association, you can enable or disable all entities within the part, visualize them with a different color, assign mesh sizes on all entities within the part, and apply different boundary conditions by part. More information on the display and management of parts can be found in Parts, in the Help manual.