Bidirectional CAD Integration
Ansys Electromagnetics CAD Integrations uses Refresh (or Generate) CAD Model to pass updates.
For example, you can make an edit in a CAD application and either run Refresh on an Ansys Electromagnetics Geometry Cell or run Generate on the UDM in the Ansys Electromagnetics window:

Refresh pulls the current state of CAD model (geometry, parameters, materials etc) and updates the corresponding data in the Ansys Electromagnetics application.
If you edit UDM (CAD) parameters in the Ansys Electromagnetics modeler window you can run the Send Parameters and Generate command:

The command passes the edited parameters to the linked CAD application and then pulls corresponding CAD geometry.
Related Topics
Ansys Electromagnetics CAD Integration Through Workbench
CAD Integration and Geometry Sharing