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There's no way to do this directly in OmniPlan itself. However, if all you want is a display of those projects' summaries (no ability to edit them), then if you know AppleScript, you could accomplish this. The AppleScript would open each client OmniPlan file, get its start date, end date and completed percentage. Then make a new project and put all those tasks in it.

In OmniPlan 2.0, we're hoping to make an overview of multiple projects a direct part of the application.