I'm absolutely new to editing notation in BIAB so this might be a stupid Q, but I am unable to find a way to create scores based on a number of instruments. What I mean is a music sheet where e.g. a trumpet, two saxes and a trombone are combined such that the staffs are grouped four by four. The sort of thing that a conductor would use.
Any help appreciated,

The Fakesheet Windows does support such scores. Check out the manual.

Welcome to the Forum!

Thanks a lot, Martin, for reaching out.
Thanks to your pointing me in the right direction, I eventually found it under help/"Display multiple tracks in lead sheet window". That works. I will now try to figure out how to set up the style such that BIAB plays back the notation, using the instruments I want. If I fail, I'll get back to this forum. Wish me luck.