I work with multiple instrumenttracks in the keyeditor.
If I have e.g. some trompetevents I want to assign to a trombone - what is the easiest way to achieve this in the keyeditor ?
Let’s begin by pretending that trompeteevents are not a standardized thing and that nobody knows what this actually means - could you describe it a bit for us, possibly adding a screenshot?
I mean MIDI events played by a trumpet part..
Ok, got it, I think.
If the MIDI track has its channel set to “Any” and your trumpet is using one channel and the trombone another midi channel than you can select the note events and change their midi channel in the Info Line
Otherwise you’ll have to move the midi part from one track to another. This can be done from inside the Key Editor by moving the part from the upper zone from one track to the other:
YES, this works! - and then I just have to glue this part together with the underlying part.
Great suggestion - Thank’s 
(Your first solution won’t work here, because it’s different VST’s.)
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You can also multiple MIDI Parts on different Tracks and see/edit them in the same Window. You can tell which Notes belong to which Track by changing how the Notes are colored from the default of Velocity to Track Color.
Yes, Raino - I already have them in different colors. My problem was how to copy them to another track.
Thank’s anyway
On the same subject.. - almost.. 
If I have say 4 tracks selected in the editor- what would be the easiest way to play e.g. a 4 note chord, and have it distributed with one note pr. track ?
Off the bat I would say: play it on one Track and then split it up using the score or logical editor. That would be fairly simple and quick …
I’m afraid my logical editor skills are not up to do this..
I understand - mine neither 
But the score editor could do it pretty easy, I think it was sth. like splitting Voices. That put every voice of your chord on its own track…
I don’t think the new score editor has the explode function 