in the toolbar - category < Clef / Key >.Show Single Parts As Transposed
You will find the menu-point of "transposing" in the root menu "Edit" to achieve the fast transposing a voice for example from Eb to F etc.
Also, you will find another function regarding transposing in the toolbar - category < Clef / Key >.
In the following dialogue, you can boast, whether a single part transposes should be shown as transposed.
You can declare about which interval the single part should be shown: more higher or more deeper. (up or down)
The MIDI-pitch remains the actual pitch of the instrument, of course.
Note that you can pick differently transposed notations in score and single parts (doesn't transpose in the score for example, and transposes in the single-voice).