Ciao Davide,
there is no way to filter Offense rules by Domain, like for Event Rules. At least until the 7.4.3. I even made a Request for Enhancement years ago that probably ended up in the trash and no one at IBM thought it would be a very useful thing for MSSPs. The only alternative I have found is to handle them by filtering the network, if you have the network hierarchy properly configured. By inserting the condition"and when the networks affected are any of" and in the variable you put the network pertaining to the tenant.
Hope it was helpful for you, but if you could do an RFE too maybe they (IBM) would give more consideration to mine too. Two is better than one.
Best
Rocco
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