Showing Component Decomposition in Diagrams

[calin2]

I have a component C1 that has 2 ports: P1 and P2.

In one large diagram D1, I show C1 simply as a component and two other components are connected to P1 and P2.

But in another diagram, D2, I want to show that C1 is actually made of two other components C11 and C12 and that the P1 delegates the functionality to C11 and C12 delegates to P2.

So, in diagram D2 I made C1 composite and I double-clicked on it and I got into the Composite Structure Diagram (let's call it D3) for C1. I added in the new components: C11 and C12. And here start the problems:

* while being in D3, I could not show that P1 delegates to C11. I tried to add the port in the diagram but I could not because it was a C1 port and C1 was not in diagram;

* Even if I was able to associate P1 to C11 (through another diagram), when I went back to D2 and I wanted to see my decomposition in the diagram (Right-Click on C1 -> Advanced -> Show Composite) it does not show that the input port delegates to C11.

Can this be done? Am I using the wrong diagram/visibility of associations?