I wrote a saxophone ensemble piece and I generated the chord symbols by selecting all the sax parts. I will like those chord cymbals to be placed in a piano part so I can generate the rhythm with the chord cymbals (like a jazz band rhythm chart).
Sorry to disappoint you, but depending on the complexity of your music, this is highly unlikely to result in anything usable. For example, here are 4 relatively simple bars from a piece a wrote for 5 saxes. I selected the saxes, right-clicked, used Generate Chord Symbols from Selection with the default settings, and this is what I get as a result:
Chord symbols show up by default in rhythm instruments. Whether they show up on others you can determine by right-clicking the player boxes (not the instrument within the box) in Setup mode and setting your preferences from the context menu there.