Since the new timeline you do not have access to the patch mode like before.
This makes it very complicated to work with surfaces in Fusion which is not really ideal at all.
In the screenshot you see three surfaces. The Modify menu has a split surface tool, which works but there
is no join poly surfaces and in this model for example splitting the vertical back face is not possible in Fusion.
This is really a must have function folks.

Here is the Rhino video and how it works there:
https://drive.google.com/file/d/0Byzv_NlyKp_2Rld2M3ZnTmVfZ2s/edit?usp=sharing
here is the fusion video and my attempt:
https://drive.google.com/file/d/0Byzv_NlyKp_2V0ZGU2xWeVYyOGs/edit?usp=sharing