Attributes are added through respective grids in the definition dialog.
To open the definition dialog for an entity on an open diagram
1 Right‑click the symbol, and then click Edit, or double-click the symbol.
The Definition (Model Object) dialog appears.
On the Attributes tab, in the Attributes List grid, click in the Data cell and type the name of the attribute. Fill out other properties for the attribute in the grid, or click Define to open the full definition.