I didn't find an answer
Later versions have improved features for transposing including just change key sig., or transpose and change key Sig. But that Dbm sure don't look right in the 2016 version. I couldn't find a way to change this, 2013 version help talks about improvements, it states:

"Better enharmonic display for transposed instruments, like alto sax.
In some key signatures, a Db was showing up on an A7 chord for example, and this is improved so that C# would be shown. (Nothing needs to be done to enable this.)"

However, I don't think it will work. There's a similar thread here

Others might know.

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