/vr/ - Retro Games

Dumb question and I'm probably a faggot but. I've never really mapped in DOOM before but I've used CAD software and I'm noticing some similarities, and I'm wondering if it's possible to auto-adjust lines, vertices etc. based on angle.
e.g. let's say I have a wall that isn't orthogonally aligned to the grid, and I want to make a decorative extrusion where the wall juts slightly outward with a glowing panel. If the wall were orthogonally aligned I could just make a rectangle 16x32 in dimension, but that doesn't seem to be as easy if the wall is angled.
Could I make a quadrangle and then adjust the angle of the lines so they become perpendicular? Or alternatively create a vertex, then create a line that's perpendicular to the line it's coming from? Or am I thinking about this entirely in the wrong way?

I imagine it's much easier to stick to the grid and avoid anything that isn't a 45 or 90 degree angle unless you're adding in decoration or altering the shape of rooms that are predominatntly orthogonal? My example of what I'm concerned about is something like this room in MAP01 of DOOM2; if I wanted to have some decoration on the walls that aren't orthogonal here, is there a way to make sure they're aligned properly instead of being slightly off-angle?