So I took a 1/4 sphere and moved the endpoint to the drawn arc on the face, then scaled it to fit and moved the outside points to match, flipped, moved, pulled, intersected and deleted the unwanted lines. I could't get it to match perfectly bcause the drawn arcs had more endpoints than the 1/4 sphere, maybe with a little forethought I could specify the the amount of segments to edit exactly. Or is there a simple way too add points in the middle of a line?

Thanks again

I didn't show the inbetween steps here, I hope this makes sense.

Thank you, I was thinking about it all wrong, I'd drawn the lines and arc's and was thinking there was a way to somehow fill it in.

Hi, I've been using Sketchup for a few months and I'm looking forward to getting better at modeling and appreciate all the help offered here. Can someone tell me what the term is for cutting out a notch like this and how I might go about doing it.