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Cascading, is it possible to put Compact NS 800N as upstream circuit breaker and Multi 9 iC60 N (or H) as downstream circuit breakers ?

No mostly not.
As the short circuit current on point of connection of the modular circuit breaker wil be too high and there is no limitation / cascading with NS800 available.
This due to the huge difference in Energy let through for both breakers.
So for your application the limitation of the cables and connections in the current traject need to be calculated to be sure the Isc is not exceeding the limit of the modular device.

In most cases a NSX160 or 250 needs to be placed between to create the needed limitation.
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