I set up a score for a brass quintet with Bb Trumpets.  The piece I am arranging goes from Db concert (Eb for trpts.) to E major concert.  I would like to score the tpts in Gb (6 flats) rather than F# (6 sharps) so the transition is a little easier.  (3 flats to 6 flats is better than 3 flats to 6 sharps!)  The key signature selection maxes out at 7 sharps and 7 flats, but this is concert pitch.  It appears I could never get a Bb instrument into 6 or 7 flats (generated by extracting from the score)?  I have Print Music 2014.  Only solution would be to create a part from a blank template and not to tag it as a Bb instrument?