If you have a user defined projection in TBC (or SPSO) and want to move it to SurvCE (FAST Survey), you need to duplicate the projection in SurvCE.
This document [ TBCtoSurvCE_R03 ] is a step-by-step.
Don’t freak out: you can complete the entire calibration in less than 3 minutes once you get the numbers ready to cut and paste.