This Finale plug-in splits a group into adjacent subgroups. The group that will be split must match the top and bottom staves of the selection. The subgroup will be of the length of the selection.
Groups will not be split if region spans exactly the same staves as a Finale 2012 multi-staff instrument (use the Change Instrument utility in Finale for that).
The created subgroups will get a hidden “(Split Group)” text at the end.