V-Groove a path I draw

I just want this to vgroove a line I draw, not to ‘fill’ an area with vgroove, I can’t find any way to do this, am I just missing it? I just want to surround a rectangle with vgroove and I’ve tried the rectangle tool and the polyline tool and both fill, so I’m guessing I need to draw 4 thin rectangles to make my surrounding area, still seems it should be easier.

http://carbide3d.com/carbidecreate/video/vcarving/

Draw a rectangle and use follow path at a suitable depth?

WillAdams yeah, that’s what I ended up doing, wasn’t as hard as I was making it just wasn’t intuitive.