Is there a way ?
Would using cross-staff notes help? Here, that would require you to be in Write mode, select that note, alt-M to put it on the lower staff, N to convert it into a cross-staff note above.
Oh no, I ‘m afraid it’s already a cross-staff note… Sorry, I don’t have a clue 
You could create a chord and leave one note in the lower staff and cross the other note to the upper staff. Then suppress playback and hide the notehead of the note in the lower staff:
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Can you show us what you’re actually trying to achieve? Do you really want a stem that go across another staff?
Hi @maresz, if you just uncheck Automatically resolve collisions between adjacent staves and systems in Layout Options, you can make whatever you want 
(but there are many disadvantages, possibly, doing so):
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Ok thanks, I see what I can do with johnkprice and Christian_R advices.
This for a special project with many unconventional notations…
In my opinion, Dorico should let you do that if you need so.
Yes, you are right, and Dorico will do so, if it makes sense. - that’s caused by its semantic approach. For some ideas it will seem like a hindrance at first, but quite often, on second thought, one will find a solution.
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And it does, if you use the settings as I showed (you need to decide: do I want collision avoidance or not?) or if you decide that you want global collision avoidance, using workarounds, as @johnkprice showed.
Dorico is very consistent, but lets freedom in case is needed.
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I don’t agree.
Any object (like a stem) should have an collision avoidance overide option that let’s you do whatever you want with it.
You are right - at least for a software, where graphical elements are just things.
So far stems in Dorico are not part of those graphical elements, but it might change if we make convincing arguments. Marek, you could flag this as a FR feature request.