You can create user-defined, reusable, and non-reusable metadata extensions for repository objects using the Workflow Manager. To create a metadata extension, you edit the object for which you want to create the metadata extension and then add the metadata extension to the Metadata Extensions tab.
To create multiple reusable metadata extensions, use the Repository Manager.
To create a metadata extension:
Open the appropriate Workflow Manager tool.
Drag the appropriate object into the workspace.
Double-click the title bar of the object to edit it.
Click the Metadata Extensions tab.
This tab lists the existing user-defined and vendor-defined metadata extensions. User-defined metadata extensions appear in the User Defined Metadata Domain. If they exist, vendor-defined metadata extensions appear in their own domains.
Click the Add button.
A new row appears in the User Defined Metadata Extension Domain.