Ah, yes. Not obvious to find until you know.

What you want are MultiStyles (2025 manual p58).

By default styles have two substyles coded blue and green in the box at the left of each bar.
Some styles have more substyles and you can create your own by a right-click on that box and "Define c/d".

This video should help, I think: Band-in-a-Box® for Windows: Part Markers Overview


Jazz relative beginner, starting at a much older age than was helpful.
AVL:MXE Linux; Windows 11
BIAB2025 Audiophile, a bunch of other software.
Kawai MP6, Ui24R, Focusrite Saffire Pro40 and Scarletts
.