On awood,,I set saw blade at 2*, and have a jig I clamp the 2x2 block to that sets it out 3/8" at rear of jig...
Then when you get the angle look you want, put the angle cut down, set saw to 90* and square sides up.
Need to start with about 1/4" more than width you want to get.
Juat a compound angle, not too hard to do!