MStower - Section Library

I'm having trouble creating text data of a new ancillaries in the ancillary section library. I want to know how to add new ancillaries (microwave antenna, mount, base station antenna) in the ancillary section library. How will I calculate af, asf, aice, zref, xcg, xicg, fcx, fcy, fzm? It will be very helpful for me if anyone show me the procedure.