I should have stated my question differently.

Attached is a revised sketch. My alignment must follow the Datum targets "C1, B1 and B2" per the new sketch. Which I have done.
The locations of "F" and "G" are dependant on datum -B-.

I have tried to construct a line between "F and G" but calypso will not accept this, "Wrong Planner Rotation" error. This error was derived after Base alignment has been established to Datum targets described above.

Now Im back to my original question. How to establish "F" and "G" as tertiary datum?

Regards

Rick Stanich
CASA/MTA/MVA
(Calypso v2.3.42. )

body2.bmp
new sketch (213,782 bytes)