Ever thought of playing Golf........its a lot easier and less frustrating.
But..sort of getting it.
The version that I think Pipeline was suggesting was to drag each track into Reaper including a midi track when it turns green on the BiaB menu. That works but seems to be a drawn out process, but could be the easiest way.
With my limited use, I have been just opening Reaper and importing BiaB via the FX with reasonable success but I haven't had bars with differing beats per bar and that's where this issue has arisen.

Noel, I think is suggesting to alter the bars after importing (I think via the FX on Reaper). Still working on that process after adding the extra bars from the intro.
Am I on the same wave length here?
funkycornwall...I shouldn't have to import into RB and then Reaper....I hope, but thanks for your input.
Music day tomorrow so will try again.
Cheers

BIAB 2022 UltraPAK
Xtra packs 1,2,3,4,5,6,13
2019 and 2018 49pak
Asus Zen Book UX533F 1TB ssd
Windows10 pro, 16g i7 64bit
Allen and Heath Z10fx mixer
Alesis V25 controller