For those who may not be familiar with MultiStyles, they are a popular arrangement programming format of PG Style developers. I think of MultiStyles as the next level up from the classic and basic Blue/Green substyles everyone's familiar with.
Besides this familiar view and use to change a song's substyle, Part Markers can be used to program the RealTrack Medley Maker, used for display purpose only (no action assigned to the Part Marker), add additional Bass and Drum patterns, modify an existing style, change a style completely, change key signature, change feel or time signature and assign sections to a song, like intro, verse, pre-chorus, chorus, bridge and outro. They also serve as markers to easily reconfigure the song structure.
I once created a custom MultiStyle to arrange 9 different RT bass instruments of a cover of Stealers Wheel "Everything will turn out fine" It created the same arrangement on a single track to match an arrangement made using 9 bass tracks and F5 Bar Settings to mute/ Return to Normal.
Another example is to arrange a instrumental Solo instead of comping the solo from multiple track recordings.
I've enclosed some example screen shots of pre-made PG Music MultiStyles. The most common, one Style Change to have four substyles, a, b, c, d for (c) Intro, (a) verse, (b) Chorus and (d) bridge, soloist or outro.
The 2nd example PG pre-made MultiStyle expands the substyles to eight. A song can have as many as 24 substyles.