Hi Larry,
There isn’t currently a direct export from Charts into SimBrief. You can copy and paste the flight string between them. You will need to create a plan in SimBrief with the departure and arrival airport, then paste the flight string into the Route Box between the departure and arrival airports.
You would then press Generate Flight to created the OFP again, ready for SF50 to load it.
Please see also Save ATC flight plan from Navigraph to Simbrief - #2 by Ian
You can also Copy to Clipboard the flight plan edited in Charts:
Cheers
Ian