Hi Alec, 

Did you get a answer to your question? We have same requirement to import CIs into multiple domain scope. I thought of running the ETL Map in global scope and provide Company value to set domain, that part is working. But it is not able to see existing CI's through identification rules, so it is creating new CIs and because of this lot of duplicate CIs are getting created. 

Please let me know if you find any thing on this to fix this issue.