We receive many questions about how to create the delegation connectors. So here’s how to do so:
(3) Now create a Part inside the Class and add a Port to it
(4) Copy the Interface (Lollipop or Socket) by using shortcut key (Ctrl+C) or [Copy] from its Pop-up menu
(5) Paste the Interface (Lollipop or Socket) on the diagram by using shortcut key (Ctrl+V) or [Paste] from its Pop-up menu
(6) Drag and drop the pasted Interface within a Class
Hope this helps. There are are several ways to depict this delegation connector but this is the fastest way to do so in the Composite Structure Diagram.