Looking for a link someone posted earlier
I believe it was someone on this board. But the link was to a video showing how to sew in a folded piece of fabric between another fabric(not sure if it was a square or a circle) , but it came out as a square on point on top of the fabric and you could fold in the sides to make it look like a curved triangle. I know this doesn't make a lot of sense, but it was basically how to sew the one piece of fabric between another without having to do the piecing. Sort of like a shortcut applique?