Create custom metadata profile in WCC

Once logged in WCC

Navigate to
Administration->Admin Applets->Configuration Manager
Add the new field by clicking on Add...

This will prompt for:

Field Name, Field Caption, Field Type and so on...

Also you will be able to create an option list

A lot of options you will have, for example, validated, non validated lists, multiselect lists, edit and select. dependant values etc ...

Note:

The field order field will allow you tu allocate the field on the desired location on the user interface.

You must make sure that the Enable User Interface checkbox is enabled.