You could save the BiaB realdrums to a wav file, then import that wav file into your RB project on a new blank track.

Or use 'drag/drop' (I think)

I'm not clear on what you mean by 'the red lines around the numbers'.
How do you 'take your song to Realband'?

Give a little more detail on how you are attempting to do everything.

I do not work here, but the benefits are still awesome
Make your sound your own!