If you want Dorico to transpose the Key Signature and chords along with the notes, you must be sure to select both the existing key signature and the selected chords.
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Dorico will not allow you to select the Key Signature unless you select it at the start of the score. If you try to select bars 8 through 15 (for example) you can only select the notes and chords. The key signature will not select.
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If you want to select from the beginning of the score through bar 4 (for example), Dorico will allow that, but then will transpose the notes and chords through bar 4, but will transpose the key signature for the entire score.
How do you select notes, chords and key signature to be transposed only for a selected section of the score.
This happens if you have an arrangement and want a female singer to sing the head and a male singer to sing the bridge. You have to transpose selected regions.