OT:

Unless the tempo is very slow, the passage for clarinet 2 is next to impossible, even if the player has a left hand Eb/Ab key. Best to write it for clarinet in A, or swap with the flute 2 part.

… I'd like to change the D#m key of the Alto Sax to E-flat m, but only from bar 49 (to bar X) in my document …

You can do it with a custom staff style that changes the Staff Transposition from Eb Transposition to D# Transposition:

Apply the custom staff style to the region where you need D# Transposition.

NB:

Beware that ‘Staff Style’ does not mean ‘Staff Attributes’.

Staff Attributes are “global”.

A custom Staff Style can be applied “locally”.

Hi,

thanks both for the help and comments.

Peter- How do I get to this menu? (Staff- Define Staff Styles... - ?)

and how do I apply it for a specific region?

… How do I get to this menu? (Staff- Define Staff Styles... - ?) …

… and how do I apply it for a specific region? …

Staff Tool.

Select the region.

Staff menu > Apply Staff Style To > …