TPS must be TotalStation Positioning Survey? Or Tacoma Public Schools, one of the two.
The best way to do it, of course, is to have known GPS coords for your total station survey before you occupy the control points.
In C3D, assuming you called your total station control some arbitrary XYZ coords, bring the points into the drawing, then ALIGN the TPS coords on to the GPS coords. You have to do this in 2D! If you have point styles that use actual elevation for the marker and do a 3D ALIGN you'll get bad results. Either set the marker style to be a fixed elevation or use temporary construction lines with the end Z's set to 0. This gets you horizontal location.
For elevation or vertical adjustment you can either use C3D to edit the points (EDITPOINTDATUM) or an AutoCAD MOVE to MOVE the points the appropriate vertical distance.
This is kind of a backwards way to do it (see above, best way to do it. Your instrumentation should have checks built in that alert you to errors when orienting the total station)- that is, doing it in C3D. It should work theoretically, but (in C3D) you better check check check, every point you can that is common to both surveys. Check every backsight shot. You'll be basing the entire TPS survey on just two points - there is no redundancy except shots on known points. Expect error but hopefully it is minimal and within acceptable tolerances.
