I am currently arranging a piece which has a few divisi parts. I will use the clarinets as the example for this question. There are two of them, and at the beginning (when they are not playing) I want them grouped together on the same staff, labelled as "Clarinets" with 1 and 2 written vertically next to the label and in front of the staff.
Later on in the piece, I want the two clarinet parts to be on separate staffs, but labelled together as "cl." with a bracket containing both staffs. I also want the staffs to be labelled "1" and "2" respectively.
Does anyone know how to achieve the above on Sibelius? I'm using Sibelius Ultimate v. 2020.9.