To create a new Struct Type click on the “+” button.
You can define a unique struct name:
Click into the appropriate field to select the type.
Click e.g. on Domain Types on the top and search for the domain type in the search bar.
After clicking on apply, the type will be applied.
In the fields table can you add the following Data Types:
Name of the field in the structure.
Base or Domain Type or even another structure or collection.
Description of the field.