How to modify upper cabinet to match vaulted ceiling?

How to modify upper cabinet to match vaulted ceiling?

Does anyone know how to make the proper modifications on a upper cabinet to fit a vaulted ceiling? I'm new to Microvellum and I tried the add/modify parts for it but cannot make the angle piece work out, if any of you have any idea please let me know.

Image 2 is what I mean by trying to add/modify parts to the upper cabinet, I got stuck on how to build an angle piece. 

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