CJ4 FMS Flt Plan with visual approach

[Pilotfirst9999]

CJ4 and flight plan

I’m having a bit of trouble understanding the theory behind inputting the the flight plan on the CJ4 screens with the keyboard below it. Is it necessary to do this if I’ve already sent the flight plan to the avionics via the EFB? I’ve watched several videos and everyone seems to do it so I’m wondering what I’m missing. Having said that, the 3 flights I’ve flown so far have all had discontinuations in the plan so I’m thinking it is necessary to manually input the flight plan?