DA provides only basic support for managing custom types and Composer should be used for full-fledged custom type management. However, DA exposes some additional type specifications that are currently not available in the Composer UI.
In DA, types are managed under the Types node in the browser tree. The File | New | Type menu option starts the New Type wizard, which is shown in the following screenshot:
This wizard has two tabs—Info and Attribute. The Info tab specifies type-level details and it shows two specifications that were not present on the Composer UI: