You can identify a data element as a characteristic using Design Studio tags. When modeling specifications, you can filter entities to display only those data elements tagged as characteristics.
To tag data elements as characteristics:
From the Solution view, double-click a Data Schema entity.
The Data Schema entity appears in the Data Schema editor.
In the Dictionary area, select the data element that you want to tag as a characteristic.
The data element subtabs appear in the Elements area.
Click the Tags subtab.
Click Add.
The Tag Selection dialog box appears.
Select Characteristic and click OK.
(Optional) Select a tag and click Remove to delete the association.
From the File menu, select Save.