Cue Notes

I'm making a score in MuseScore, and I'm currently working on the tuba part. There's a Bari Sax cue in the part. What I did earlier in a Contrabassoon cue was change the instrument to contrabassoon, and make all the notes small, so I did the same thing for Bari Sax, but the part transposed into Eb, not C. How to I keep the key the same, so the Ab I have written doesn't become an F?