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I extruded a surface, then used the Trim command to use the existing curves to cut off the corners. I was then able to merge this into the existing quilt.
See attached picture for the resulting surface (before merging).
exactly... I was just looking at the picture and thinking through the number of possibilities, order of clicks, and wondering how I could possibly answer the question in a helpful way without writing a book! Sometimes a simple extrude works best! 😉