Thanks for the help.
I'm curious how such a thing ended up merely being called an Offset Section because that was nothing like expected.
Using that option though doesn't make the two cuts lay as though the cutting plane were a flat datum plane like my company's drawn it in AutoCAD. I hope Creo's not too smart with trying to keep it looking like a 3D entity.
As for removing an item from the section, it didn't update when I repainted but going in and editing the view's properties made it properly repaint alright. No wonder why it wouldn't go for me earlier.