You can also create you structure using Speed Mode. First, search for and select your Service Management projects.
On the hierarchy screen, add a grouping level above your standard issue types - we've grouped our items by issue type. If you want to include additional issue types, or organize your hierarchy differently, you can do that here as well.
If you have a large queue, you may want to filter your results: hover over the Standard issue types line, click the the three dots, and select Filter.