The Variables editor contains a Variables tab that displays a list of variables defined for the artifact and a Types tab that you use to define and edit data types for the artifact. You can use the Filter text field to filter the list of variable and types. This screenshot shows the Types tab that lists a defined type that is an object type with several attributes. You use the Type Information pane to view and edit the properties of the type or attribute that is selected in the list.
You can click + in the to add new attributes to the type.
Clicking the + Type button opens a menu where you can choose to create a new custom type or a new type from an endpoint.