Playback template modifications

My default playback template is BBSO Core. I have modified an Expression map (BBSO Timpani) related to this PT. How can I save the PT in order to reuse it in future projects ?

You’ll need to re-save the “Endpoint Configuration” for that group of instruments. (I think John Barron provided Dorico project files for each instrument group that has its own Endpoint.)
Once that’s done, new projects using that Template will pick up the revised Endpoint. For old documents, you’ll have to re-apply the Playback Template to get the revision. (Or just manually import the revised Maps.)

Thank you ben !