If you have access to Report Builder, you could create requests for each individual suites, then use Excel to add the data together....
Or since you are doing something like PVs, you could use Workspace with a panel for each suite, then you can manually add the values together.
There is no way to really pull consolidated data from multiple suites... (there used to be a "rollup suite" but it never really worked to well, and Adobe no longer recommends using them).
For future reference, if all your sites are using the same tagging; you could consider tracking all 30 sites in a global suite, then using Virtual Report Suites to create individual site suites from the one global suite. This will allow you to get a consolidated view of everything together, while still having individual suites that you can use for each site... but this only works if the tracking uses the same prop, eVar, events, etc definitions.