Hi Julien, if you have Dorico Pro you can make use of the Clef and Transposition Overrides feature, which allows you to show the same flow/music with different transpositions in different layouts.
If you make those layouts “part” layouts (regardless of how many players are assigned to them), you can propagate the formatting between them, so they have exactly the same casting off.
Additionally, another user @dan_kreider recently shared a way of essentially doing octave transposition locally without using octave lines, using the octave shift for clefs but using invisible clefs.