cutting a 2" ss coupling using the surface of a 6" x 4" ss reducer

I am trying to create a surface using two existing standar parts. I want to "cut" a coupling to sit flush on a reducer on a 45 deg angle. I have done this before but apparently deleted it from my brain. Can anyone help me with this.  Thank you in advance. I have attached a pdf of what I am trying to do.

John White

Design Engineer

Enaqua

jwhite@enaqua.com

SolidworksGeneral