How to surface loft 3 pipes together of different size to create Y pipe

I am trying to make a Y pipe.  Two connected at a 90 degree angle and the other is connected at 135 degrees.  An online tutorial showed this using a surface loft to connect each of the 3 pipes.  In the tutorial they can connect 2 pipes by surface lofting one edge of a pipe with another edge.  When i try to loft 2 pipes together, a loft brings both pipes together completely, instead of just one edge and this does not allow me to connect all 3 pipes. Im new to SW but really appreciate anyone's help!

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