I have finally figured out how to import a saved flight plan directly into the FMS of the Aerosoft CRJ.
First you need a flight plan in Aerosofts .flp flight plan format. SimBrief will export to this plan.
Then the file needs to be copied here:
In the CRJ FMS:
Press FPLN Button.
Press LSK 6L <SEC FPLN
Press LSK 5L <ROUTE MENU
Press LSK 1lL <PILOT ROUTE LIST
Press LSK 1L/R, 2L/R, 3L/R, or 4L/R to select the desired flight plan.
You will see ROUTE LOADED (MSG) at the bottom of the FMS screen in amber.
Press LSK 5L <SEC FPLN
Press LSK 5R ACTIVATE>
Press the EXEC button
Note that airways are not loaded in the FMS. Instead you will get direct routes to every waypoint along the airways you specified in your SimBrief flight plan.
I got this info from the documentation in:
From SimBrief you should be able to export both a MSFS and Aerosoft flight plan. Then you could load the MSFS one at the world map and the Aerosoft one in the CRJ and they should match.
P.S. Im going to bed so I will not be able to answer any followup questions until tomorrow.