@ThiagoCN
Theoretically subdomains are 'separate' domains and so by strict definition, separate domains are not supported.
Why?
Well at the end of the day, NPrinting service user domain account must have the potential ability to access computer and network resources across the entire domain.
For example, if say you want to export reports to a network nprinting 'destination' you need to give NTFS (file and folder) permission to the NPrinting domain service user account to access a network folder.
If you are in different domains, and you try to access a network folder (or computers) in a different domain, you will be prompted with a request for credentials.
NPrinting can't enter credentials in the background automatically when it is asked to open a network folder in a different domain.
Now again, theoretically, if you have two way trusts between your primary and subdomains (thus mitigating the need for credential requests) subdomains (within the same AD forest) could 'potentially' work.
So working with your AD team is essential to develop and test all this.
Otherwise the NPrinting service user domain account, (as well as any NPrinting, QV, QS server) and any network folders it may need access to by default should be in the same domain.
Hope this helps...
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