Multiple Domains

I am evaluating the possibility of getting Service Desk to manage 3 domains with separate budgets. My main issue at the moment is managing software licenses across the 3 domains. e.g. we may have 20 MS Office licenses for domain 1 and 15 for domain 2. The issue is that the software is identified through the scans and does not differentiate between software found on different domains. As far as I can see I have to manage and allocate licenses as a single batch.

Is this correct or does anyone know of a way around this?

I'd also be interested to know if anyone knows how to get minor versions treated as the same product? e.g. Adobe Acrobat verion 7.0 and Adobe Acrobat version 7.0.8.