Custom labelling for staves

How do you customize staff lables for instruments to show up differently on different pages? For example, I have 3 horns in the score on which I am currently working, Sometimes i would like to have them show up just one to a line, sometimes I would like the following:

          1 - 2
cor
          3

and on some pages I would like this:

          1, 3
cor
          2


How do I do th is in Dorico?

If you choose these two Engraving Options:

then the staff labels will follow the voice distribution:

And you can set the voice distribution with Condensing Changes:

Thank you. Can I do this if the parts are spread over 2 lines?

Yes, thanks to the Condensing Changes, you can imagine any combination you want!

Thanks! I may ask for more details about this later on