This was supposed to be a discussion about Sibelius. World Parts have Eb Sop, Bb Cornets, Bb Flugel, Eb Tenors, Bb Baritones (usually TC), Bb Euphs (BC), Bb Trombones (BC), Eb Tubas (BC) BBb Tubas (BC). Although the Euphs through Tubas are listed as Bb, they are really in concert pitch. Bb is used because open valves or 1st position plays Bb. Like you said, no one publishes parts, world or otherwise, in concert key for every instrument.
I just wanted Sibelius to play TC BBb Tuba down 2 or 3 octaves where it SOUNDS, not where it is written. Did that make any sense? The last piece I bought was "Those Daring Young Men and Their Flying Machines". It had both sets of parts.
In the US, many players cannot read TC parts for Euph through Tuba. In an orchestra, such parts are in bass clef. Often US bands the MD or someone with transposing talent (or good with Sibelius or Finale) will re-write the Euph down to Tuba parts into bass clef. It is illegal technically. So is photocopying music so it can be marked up, but most bands do it anyway.
How a piece is written and how it SOUNDS are two different things. I wanted Sibelius to "play" the score how it should sound, not necessarily how it is written.