I see two ways to create a work type: one from work type dropdown in a work item (Add Custom Work Type), and another using Jira Admin to configure work types (Work Items, Add work type).
A "Custom work type" created within a work item from the work type dropdown does not appear in the Jira Admin work type default list, so cannot be put into a hierarchy.
Could you please explain the differences between the work types created using each of these two ways? Thanks.