The special characters token for an em-dash is:
&:m
The token for and en-dash is
&:n
Note that there is no non-breaking form of these characters, because QuarkXPress and InDesign will never break after an en-dash (unless it is followed by a discretionary return) but on the other hand QuarkXPress and InDesign will always crash after an em-dash.
Topic 173650, last updated on 13-Dec-2022