Is there an easy way to do roll up reporting in Google Analytics when you have multiple domains and each has at least 2 subdomains?
So far as I'm aware you can't, you'd need to download the relevant data and crunch it manually.
You can follow the instructions here, which walk you through the process of structuring a rollup account to generate reports:-
No need to panic. This post aims to offer an approach to help you plan your Google Analytics accounts setup in a structured fashion to help with clarity. I hope that by following the approach and the technical steps, you will be able to collect and manage all your data, make more sense of it, and most importantly, ensure what you are reporting on, trending, dashboarding and analyzing is based on accurate data.
Some further reading is available in google groups