Thanks for the replies. I was able to work through what I was trying to do. I set up a similar scenario departing KROC RWY 22 on the Xerox2 departure, then Rnav 22 approach, Magen transition. After takeoff and initial climb the FMC was on the (VECTOR) leg. On the Legs page there was nothing that I could do to advance beyond the (VECTOR) step. Pressing the Magen soft key or any other key had no effect. However, when I switched to the RTE page I was able to delete the whole SID, press exec, turn to intercept, then enter LNAV to continue the route. I watched the 737NGX video and conclude that the behavior of 737NG and 737NGX are different. Deleting the SID works for continuing to the enroute portion for departure.