You need to save the Flight Plans to the Documents\Prepar3D v3 Files folder, or save to the Documents\Flight Simulator X Files folder then copy them across to the Documents\Prepar3D v3 Files folder (depending on where the CDU/FMC looks for the plans), then load them into the CDU/FMC. Do not save the plans with the SID/STAR, but use FSC to show you which SID/STAR to use for your flight(s).