Since that was just a needed venting, here's a question someone may know --
Start from import DWG into 2D, so I don't have a real model, I have an imported "Model" that's been generated by SW as some nebulous thing (i.e., no clear origin, no obvious sketch planes, line segments that can be magically "folded" by the 2D-3D toolbar, etc.)
From the "top" of the "Model" (which is removed by several inches above the model extrusion, which was created from the "left side" of the "Model" magically-folded projection -- look how ridiculous this is already, those are SW's special words and terms), I've used the "project cutout" button (far right) of the magic 2D-3D toolbar, using cut from face (of the resulting model) up to next face (of the resulting model). This works, there are holes in the model that are magically projected from the "top" of the "Model" (i.e., imported 2D DWG).
What I need is to somehow get a sketch of the holes on the face of the model, just exactly as would exist had I (more wisely) just drawn this whole thing from scratch by myself without any import or magical but confusing 2D-3D tools.
Convert Entities in sketch mode (of either the "Model" or the resulting 3d model itself) does not seem to work. I just need to project the holes made in the part onto anything that can then be edited normally, because ultimately (and I think reaosnably) I'd like to delete the original "Model" that was imported from DWG. If I delete it now, the "sketch" (i.e., "top" of "Model") that is creating the holes in the resulting 3d model goes away, screwing everything up.
Why do I feel like a pretzel? It often feels like using SW requires thinking in some unusual and tipsy manner... I'm sure the answer is so ridiculously easy. But it's so ridiculously not obvious.