When you are prompted for a location in a drawing, you can use one of several methods to specify the coordinates.
Specify a Location in the Drawing
Enter X, Y (and Z, if prompted) coordinates at the command line, separated by a comma. Alternatively, click a location in the drawing. You can use AutoCAD Object Snaps to select a point accurately.
Use Civil Transparent Commands
Some of the Civil transparent commands calculate point locations from angles, distances, and drawing geometry. For more information, see Transparent Commands.
You can send drawing coordinate information to the command line based on cursor location and a specified surface. For more information, see The Coordinate Tracker.