right or wrong???

I was under the understanding, that previous A/B lines or Identical Curve lines, had to be ALREADY programmed into the monitor (for current field), for TurnPath to work.

Thus if a person just came from WAAS, where he never saved any Guidance lines, at all; then he finally upgrade his GPS corrections, This Year to something like TS-C Pro or RTK, then he would still need to perform one operation (while saving guidance lines) WITHOUT using TurnPath; then on his next field function/event; he could actual use the TurnPath feature? (Because he would have previous A/B lines, for his 2nd field pass/event) 

Maybe one can create guidance lines WHILE going across interior of new field (1st time, but has outer boundaries, already saved) WHILE using TurnPath function ?????