Note that Umbrello UML Modeller will not create any kind of Diagram for showing your classes, they will only be imported into your Model so that you can use them later in any diagram you want.
Once you've done that, it looks like you just drag and drop the items onto the class diagram and it even connects them for you.
From the handbook:
Note that Umbrello UML Modeller will not create any kind of Diagram for showing your classes, they will only be imported into your Model so that you can use them later in any diagram you want.
Once you've done that, it looks like you just drag and drop the items onto the class diagram and it even connects them for you.