In previous versions of OpenROAD Workbench, you could create a composite field only by inserting a ScalarField and then grouping it into a composite field. You can now insert composite field types directly from the Frame Editor's floating menu bar by clicking Insert, Field, CompositeField.

For more information about how to create composite fields, in the Workbench User Guide see "Composite Fields," "Create a Composite Field," and the sections for creating specific field types.