Hi, how can I create an enharmonic transposition of a single instrument (clarinet in B flat) within a score without changing it for all others too???
Could you tell a bit more? Are talking about the score or the part? Do you want to change the Key Signature (like Db instead of C#) or just to respell the notes?
The piece I’m working on is written in A major key. There are 13 different instruments in the score including a clarinet in B flat. So for the clarinet the written key is B. Due to the melody line I end up with a number of double sharps, which makes it difficult to read for semi professional musicians. I’d prefer to have this part in the score and the single clarinet part displayed in C flat instead since it’s then much easier to read. How can I change the key just of the clarinet within the transposing score and in the single clarinet part to the enharmonic shifted key?
If this is not possible I’d like to see at least the single clarinet part being respelled and displayed with the enharmonic shifted keys.
Respelling is easy to be done, but I can’t find a way to change the general key of just the part without changing it for the entire score.
See here: Inputting Independent Key Signatures in each instrument - #2 by StevenJones01
(From post above) Click on the staff at the place where you want the key-signature to appear, press Shift-K to bring up the key signature popover, enter the key signature, then press Alt-Enter :
Wonderful! Thank you! Very helpful!
In order to get Clarinet in B Flat to have a key signature of C Flat Major in a transposed score or part, you need to do three things:
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Go to Library > Notation Options > Accidentals > Transposition and uncheck Prefer enharmonic equivalent key signatures with fewer accidentals.
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In the key signatures panel in the right zone of write mode, edit the tonality system and create a custom key signature for B Double Flat Major:
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Select the first note or rest in the clarinet staff, hold down the Alt/Opt key and click on the custom key signature in the right zone to obtain this:
I’m glad you’ve got the solution for your query. And I’ll admit to my shortcomings as a musician (I need to practice 30 hours a day just to approach mediocrity), but why not just write for a Clarinet in A? I wouldn’t want to play in either key! 
Usually I would just have the asked the player to switch to a clarinet in A, but in this particular situation it’s a mixed local ensemble of professionals and amateur musicians and unfortunately there is no clarinet in A available (very uncommon in bavarian wind band tradition); so I have to stick to what is available for my christmas opera for the city of Bad Hindelang …
Admittedly I have not seen your score and the implications thereof, but I would tend to write in B where I could and then just change the passages enharmonically where the excessive double sharps and the like would appear.
Key signatures are always entered in concert pitch, even for transposing instruments. Post #4 shows that giving Clarinet in B Flat an independent key signature of C Flat Major yields a key signature with 5 flats rather than 7 in a transposed score. If you want that instrument to have a key signature with 7 flats in a transposed score or part, you need to give it an independent key signature with 9 flats. But Dorico only has built-in key signatures with up to 8 sharps or flats. To use a key signature with 9 flats, you have to create it yourself. I gave the necessary steps in post #6.
I thought something like that might be the case. If a local ensemble, I would go with whichever key signature choice your clarinetist prefers (which is what I’m assuming you’ve already done). 
