Just thought I’d share this plugin I found in Fusion 360 as it may be useful for others here. Basically Shaper Tools have a plugin for Fusion 360 which allows you to select a face on your model and export it as an SVG. Here’s a link to it in the Autodesk store
So basically I was able to design this air return grate for my forced air system in my home
and then export it as an SVG which I imported into Carbide Create to do the CAM part.