Edit | Undo should undo the last action — and continue for a bit (at least three, just tested).
For cutting such an angle you have a couple of options:
model it in Carbide Create Pro
use a V tool which cuts the desired angle
use a fixture to secure the stock at the requisite angle and surface it off
draw a series of lines and assign appropriate depths to cut the desired angle
hand-code a G-code file which will make the cut
I’ve actually been working on a tool to make that latter a bit easier — if you’ll let me know the specific dimensions involved I’ll work up an example file and post the G-code from it for you to try out in a piece of scrap — if that works, you can then try it for real.
That said, there’s no way that doing this on a CNC router is going to be as quick as a table saw — if you have that option, and need to do this on a regular basis, my inclination would be to make a jig on the CNC which would allow you to make the cut on the table saw.