If you want to use the pln from LNM there are 2 choices:
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Start you SIM flight with the pln. Then use the FMC to “import” from the SIM flight plan.
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Enter manually from LNM.
This is far easier than people think. LNM will show the Airways and the multiple waypoints in that airway. In the WT CJ4 you just enter the Airway and the exit waypoint for each Airway. There is no need to enter every waypoints in the airway. Then just complete with Departure and Arrival and some solo waypoints there maybe.
LNM creates pretty good flight plans with individual fine controls over how much airways and waypoints you want to use.