When drafting patterns from books, most point are added a specified distance from existing points. The Add Point from Point tool lets you do this very easily.
Select the point used as the starting position.
You'll see a bright green point has been added on top of the selected point. Enter the movement values in the X Position and Y Position boxes. Remember that a negative X moves left and a negative Y moves up.
The new point will move the distances you have specified.
The new point will be saved and the reference point will still be in its original position untouched.