- Click “Add New” in your content browser.
- Select “Blueprints” → “Structure”.
- Type a name for your struct.
- Double click on your new struct and add included types.
- In your Blueprint you can now add that struct as a variable type.
- You struct will appear under the “Structure” section when you select a variable type, see here https://docs.unrealengine.com/latest/INT/Engine/Blueprints/UserGuide/Variables/Structs/index.html#creatingstructs for information on how to select the struct, split the struct, etc…
Hope that helps.