This is a multistyle from Biab instantly in Reaper, identical, that's how the BBPlugin will work. Old users make it all up in Biab and then instantly transferred to the BBPlugin in the DAW, any editing or changing in the main Biab can be easily re-transferred.
I even suggested you could have a "Transfer" button on the BBPlugin that will do this.
That's why I suggested that Biab writes the current data for all tracks to bb\Data\BBoutput.txt
so the BBPlugin will read and load the data of the current Biab session, but you won't have to go and make cups of coffee while it's being done.