Drawing line features using angles

I have been googling this but I don't think I am using the right terms to get what I am looking for. I work for a water/waste water utility and we have fittings the determine the angle a pipe turns from another pipe, just like the plumbing in your home. What I am looking for is a tool that gives me a series of angles, 90, 45, 22.5, 11.25, ect so that when I select this angle I am only allowed to draw a line at the specified angle off the line I am snapped to, or off the previous line segment. Anyone know of any tools that are predefined to accomplish this, or know of away I can set something up? Thanks for any input; Tyler