Insert UDM Command on Draw Menu

To insert a UDM into a design, use the User Defined Model command on the Draw menu for the Modeler window.

User Defined Model button.
Related Topics:

User Defined Model (UDM)

UDM compared to User Defined Primitives

UDM Properties

Library of Models for CAD Integration

See the HFSS 3D Layout Scripting Guide for information about Creating User Defined Primitives and User Defined Models in Python Scripts.