That only some of the NC Sequence types have been implemented in the Manufacturing Process Table dialog. I have tried the following: Face milling, Trajectory milling, Roughing, Reroughing, Finishing, Corner Finishing, Manual Milling Cycle, and Drilling seem to work within the dialog. Others just leap to the old interface.
This is a dog when planning teaching curriculum. I will have to decide whether to present the old interface, restict operations to those in the new interface or risk some confusion trying to teach both.
Having got the answer, I find it is properly documented in the Help Topic Collection - nc.pdf.