This is the method I use also. You have your two conduits at different elevations...draw a 90 on one of them...then rotate the 90 and connect it to the other conduit.
Things to watch for: make sure the end of the 90 is perfectly aligned with the end of the other conduit, and don't rotate the 90 too far for the given elevation difference...i.e. you can't use a 45 degree kick for a 1inch change in elevation. Oh and when you rotate the 90, don't rotate the conduit that it is attached to...only select the 90 degree fitting. When a conduit is rotated along its axis, you get unexpected results when need to add to that conduit run.